mirror of
https://github.com/rasbt/python_reference.git
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typo fix in legb tutorial
This commit is contained in:
rasbt
parent
3fc278cae3
commit
0a567380c9
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@ -1,12 +1,4 @@
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{
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"metadata": {
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"name": "",
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"signature": "sha256:b33e0c5563d80d68580ea6ce62ae2703856ccde40aec8ff9fb1364ac70d70521"
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},
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"nbformat": 3,
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"nbformat_minor": 0,
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"worksheets": [
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{
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"cells": [
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{
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"cell_type": "markdown",
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@ -20,36 +12,36 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"%load_ext watermark"
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],
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"language": "python",
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"metadata": {},
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"execution_count": 1,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"prompt_number": 1
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"source": [
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"%load_ext watermark"
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]
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"%watermark -a 'Sebastian Raschka' -v -d"
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],
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"language": "python",
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"metadata": {},
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"execution_count": 2,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"Sebastian Raschka 04/07/2014 \n",
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"Sebastian Raschka 01/27/2016 \n",
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"\n",
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"CPython 3.3.5\n",
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"IPython 2.1.0\n"
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"CPython 3.5.1\n",
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"IPython 4.0.3\n"
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]
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}
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],
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"prompt_number": 3
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"source": [
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"%watermark -a 'Sebastian Raschka' -v -d"
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]
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},
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{
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"cell_type": "markdown",
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@ -199,8 +191,21 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 1,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"1 global\n",
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"5 in foo()\n"
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]
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}
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],
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"source": [
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"i = 1\n",
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"\n",
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"def foo():\n",
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@ -210,20 +215,7 @@
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"print(i, 'global')\n",
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"\n",
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"foo()"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"1 global\n",
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"5 in foo()\n"
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]
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}
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],
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"prompt_number": 1
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},
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{
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"cell_type": "markdown",
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@ -258,8 +250,22 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 11,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"loc in foo(): True\n",
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"loc in global: False\n",
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"glob in global: True\n"
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]
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}
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],
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"source": [
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"#print(globals()) # prints global namespace\n",
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"#print(locals()) # prints local namespace\n",
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"\n",
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@ -272,21 +278,7 @@
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"foo()\n",
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"print('loc in global:', 'loc' in globals()) \n",
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"print('glob in global:', 'foo' in globals())"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"loc in foo(): True\n",
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"loc in global: False\n",
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"glob in global: True\n"
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]
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}
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],
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"prompt_number": 11
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},
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{
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"cell_type": "markdown",
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@ -319,22 +311,14 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"import numpy\n",
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"import math\n",
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"import scipy\n",
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"\n",
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"print(math.pi, 'from the math module')\n",
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"print(numpy.pi, 'from the numpy package')\n",
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"print(scipy.pi, 'from the scipy package')"
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],
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"language": "python",
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"metadata": {},
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"execution_count": 8,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"3.141592653589793 from the math module\n",
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"3.141592653589793 from the numpy package\n",
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@ -342,7 +326,15 @@
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]
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}
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],
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"prompt_number": 8
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"source": [
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"import numpy\n",
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"import math\n",
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"import scipy\n",
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"\n",
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"print(math.pi, 'from the math module')\n",
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"print(numpy.pi, 'from the numpy package')\n",
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"print(scipy.pi, 'from the scipy package')"
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]
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},
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{
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"cell_type": "markdown",
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@ -389,8 +381,12 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 1,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"a_var = 'global variable'\n",
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"\n",
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"def a_func():\n",
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@ -398,11 +394,7 @@
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"\n",
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"a_func()\n",
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"print(a_var, '[ a_var outside a_func() ]')"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 1
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]
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},
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{
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"cell_type": "markdown",
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@ -451,8 +443,12 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 2,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"a_var = 'global value'\n",
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"\n",
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"def a_func():\n",
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@ -461,11 +457,7 @@
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"\n",
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"a_func()\n",
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"print(a_var, '[ a_var outside a_func() ]')"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 2
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]
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},
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{
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"cell_type": "markdown",
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@ -509,8 +501,22 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"global value [ a_var outside a_func() ]\n",
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"local value [ a_var inside a_func() ]\n",
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"local value [ a_var outside a_func() ]\n"
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]
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}
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],
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"source": [
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"a_var = 'global value'\n",
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"\n",
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"def a_func():\n",
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@ -521,21 +527,7 @@
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"print(a_var, '[ a_var outside a_func() ]')\n",
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"a_func()\n",
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"print(a_var, '[ a_var outside a_func() ]')"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"global value [ a_var outside a_func() ]\n",
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"local value [ a_var inside a_func() ]\n",
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"local value [ a_var outside a_func() ]\n"
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]
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}
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],
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"prompt_number": 3
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},
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{
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"cell_type": "markdown",
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@ -546,24 +538,15 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"a_var = 1\n",
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"\n",
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"def a_func():\n",
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" a_var = a_var + 1\n",
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" print(a_var, '[ a_var inside a_func() ]')\n",
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"\n",
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"print(a_var, '[ a_var outside a_func() ]')\n",
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"a_func()"
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],
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"language": "python",
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"metadata": {},
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"execution_count": 4,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"ename": "UnboundLocalError",
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"evalue": "local variable 'a_var' referenced before assignment",
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"output_type": "pyerr",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mUnboundLocalError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-4-a6cdd0ee9a55>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 6\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 7\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma_var\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;34m'[ a_var outside a_func() ]'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 8\u001b[0;31m \u001b[0ma_func\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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@ -572,14 +555,23 @@
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"1 [ a_var outside a_func() ]\n"
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]
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}
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],
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"prompt_number": 4
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"source": [
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"a_var = 1\n",
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"\n",
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"def a_func():\n",
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" a_var = a_var + 1\n",
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" print(a_var, '[ a_var inside a_func() ]')\n",
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"\n",
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"print(a_var, '[ a_var outside a_func() ]')\n",
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"a_func()"
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]
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},
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{
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"cell_type": "markdown",
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@ -618,8 +610,12 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 4,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"a_var = 'global value'\n",
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"\n",
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"def outer():\n",
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@ -632,11 +628,7 @@
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" inner()\n",
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"\n",
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"outer()"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 4
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]
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},
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{
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"cell_type": "markdown",
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@ -678,8 +670,22 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 5,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"outer before: local value\n",
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"in inner(): inner value\n",
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"outer after: inner value\n"
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]
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}
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],
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"source": [
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"a_var = 'global value'\n",
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"\n",
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"def outer():\n",
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@ -692,21 +698,7 @@
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" inner()\n",
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" print(\"outer after:\", a_var)\n",
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"outer()"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"outer before: local value\n",
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"in inner(): inner value\n",
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"outer after: inner value\n"
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]
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}
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],
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"prompt_number": 5
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},
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{
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"cell_type": "markdown",
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@ -735,8 +727,12 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 6,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"a_var = 'global variable'\n",
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"\n",
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"def len(in_var):\n",
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@ -751,11 +747,7 @@
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" print('Input variable is of length', len_in_var)\n",
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"\n",
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"a_func('Hello, World!')"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 6
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]
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},
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{
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"cell_type": "markdown",
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@ -785,7 +777,7 @@
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"source": [
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"### Here is why:\n",
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"\n",
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"Since the exact same names can be used to map names to different objects - as long as the names are in different name spaces - there is no problem of reusing the name `len` to define our own length function (this is just for demonstration pruposes, it is NOT recommended). As we go up in Python's L -> E -> G -> B hierarchy, the function `a_func()` finds `len()` already in the global scope first before it attempts"
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"Since the exact same names can be used to map names to different objects - as long as the names are in different name spaces - there is no problem of reusing the name `len` to define our own length function (this is just for demonstration pruposes, it is NOT recommended). As we go up in Python's L -> E -> G -> B hierarchy, the function `a_func()` finds `len()` already in the global scope (G) first before it attempts to search the built-in (B) namespace."
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]
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},
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{
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@ -813,8 +805,12 @@
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"execution_count": 59,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"a = 'global'\n",
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"\n",
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"def outer():\n",
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@ -841,11 +837,7 @@
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"\n",
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"print(len(a))\n",
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"print('a is', a)"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 59
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]
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},
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{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -895,8 +887,20 @@
|
|||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 42,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"8\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"a_var = 2\n",
|
||||
"\n",
|
||||
"def a_func(some_var):\n",
|
||||
|
|
@ -904,19 +908,7 @@
|
|||
"\n",
|
||||
"a_var = a_func(a_var)\n",
|
||||
"print(a_var)"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"output_type": "stream",
|
||||
"stream": "stdout",
|
||||
"text": [
|
||||
"8\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"prompt_number": 42
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -938,52 +930,56 @@
|
|||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 6,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"print('Example 1.1:', chr(int('01100011',2)))"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"prompt_number": 6
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 7,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"print('Example 1.2:', chr(int('01100010',2)))"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"prompt_number": 7
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 8,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"print('Example 2.1:', chr(int('01100011',2)))"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"prompt_number": 8
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 9,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"print('Example 3.1:', chr(int('01100010',2)))"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"prompt_number": 9
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"execution_count": 58,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"# Execute to run the self-assessment solution\n",
|
||||
"\n",
|
||||
"sol = \"000010100110111101110101011101000110010101110010001010\"\\\n",
|
||||
|
|
@ -1001,11 +997,7 @@
|
|||
"sol_str =''.join(chr(int(sol[i:i+8], 2)) for i in range(0, len(sol), 8))\n",
|
||||
"for line in sol_str.split('\\n'):\n",
|
||||
" print(line)"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": [],
|
||||
"prompt_number": 58
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -1032,26 +1024,26 @@
|
|||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"for a in range(5):\n",
|
||||
" if a == 4:\n",
|
||||
" print(a, '-> a in for-loop')\n",
|
||||
"print(a, '-> a in global')"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"execution_count": 5,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"stream": "stdout",
|
||||
"text": [
|
||||
"4 -> a in for-loop\n",
|
||||
"4 -> a in global\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"prompt_number": 5
|
||||
"source": [
|
||||
"for a in range(5):\n",
|
||||
" if a == 4:\n",
|
||||
" print(a, '-> a in for-loop')\n",
|
||||
"print(a, '-> a in global')"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -1062,27 +1054,27 @@
|
|||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"b = 1\n",
|
||||
"for b in range(5):\n",
|
||||
" if b == 4:\n",
|
||||
" print(b, '-> b in for-loop')\n",
|
||||
"print(b, '-> b in global')"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"execution_count": 9,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"stream": "stdout",
|
||||
"text": [
|
||||
"4 -> b in for-loop\n",
|
||||
"4 -> b in global\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"prompt_number": 9
|
||||
"source": [
|
||||
"b = 1\n",
|
||||
"for b in range(5):\n",
|
||||
" if b == 4:\n",
|
||||
" print(b, '-> b in for-loop')\n",
|
||||
"print(b, '-> b in global')"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -1093,25 +1085,25 @@
|
|||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [
|
||||
"i = 1\n",
|
||||
"print([i for i in range(5)])\n",
|
||||
"print(i, '-> i in global')"
|
||||
],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"execution_count": 1,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"stream": "stdout",
|
||||
"text": [
|
||||
"[0, 1, 2, 3, 4]\n",
|
||||
"1 -> i in global\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"prompt_number": 1
|
||||
"source": [
|
||||
"i = 1\n",
|
||||
"print([i for i in range(5)])\n",
|
||||
"print(i, '-> i in global')"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
|
|
@ -1128,21 +1120,40 @@
|
|||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"This goes back to a change that was made in Python 3.x and is described in [What\u2019s New In Python 3.0](https://docs.python.org/3/whatsnew/3.0.html) as follows:\n",
|
||||
"This goes back to a change that was made in Python 3.x and is described in [What’s New In Python 3.0](https://docs.python.org/3/whatsnew/3.0.html) as follows:\n",
|
||||
"\n",
|
||||
"\"List comprehensions no longer support the syntactic form `[... for var in item1, item2, ...]`. Use `[... for var in (item1, item2, ...)]` instead. Also note that list comprehensions have different semantics: they are closer to syntactic sugar for a generator expression inside a `list()` constructor, and in particular the loop control variables are no longer leaked into the surrounding scope.\""
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"collapsed": false,
|
||||
"input": [],
|
||||
"language": "python",
|
||||
"metadata": {},
|
||||
"outputs": []
|
||||
"execution_count": null,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": []
|
||||
}
|
||||
],
|
||||
"metadata": {}
|
||||
"metadata": {
|
||||
"kernelspec": {
|
||||
"display_name": "Python 3",
|
||||
"language": "python",
|
||||
"name": "python3"
|
||||
},
|
||||
"language_info": {
|
||||
"codemirror_mode": {
|
||||
"name": "ipython",
|
||||
"version": 3
|
||||
},
|
||||
"file_extension": ".py",
|
||||
"mimetype": "text/x-python",
|
||||
"name": "python",
|
||||
"nbconvert_exporter": "python",
|
||||
"pygments_lexer": "ipython3",
|
||||
"version": "3.5.1"
|
||||
}
|
||||
]
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 0
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user