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palindrome timeit

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rasbt 2014-04-14 00:10:12 -04:00
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"cells": [
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"cell_type": "markdown",
"metadata": {},
"source": [
"Sebastian Raschka 04/2014\n",
"\n",
"#Timing different Implementations of palindrome functions"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import re\n",
"import timeit\n",
"\n",
"# All functions return True if an input string is a palindrome. Else returns False.\n",
"\n",
"\n",
"\n",
"####\n",
"#### case-insensitive ignoring punctuation characters\n",
"####\n",
"\n",
"def palindrome_short(my_str):\n",
" stripped_str = \"\".join(l.lower() for l in my_str if l.isalpha())\n",
" return stripped_str == stripped_str[::-1]\n",
"\n",
"def palindrome_regex(my_str):\n",
" return re.sub('\\W', '', my_str.lower()) == re.sub('\\W', '', my_str[::-1].lower())\n",
"\n",
"####\n",
"#### functions considering all characters (case-sensitive)\n",
"####\n",
"\n",
"def palindrome_reverse1(my_str):\n",
" return my_str == my_str[::-1]\n",
"\n",
"def palindrome_reverse2(my_str):\n",
" return my_str == ''.join(reversed(my_str))\n",
"\n",
"def palindrome_recurs(my_str):\n",
" if len(my_str) < 2:\n",
" return True\n",
" if my_str[0] != my_str[-1]:\n",
" return False\n",
" return palindrome(my_str[1:-1])\n"
],
"language": "python",
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"input": [
"test_str = \"Go hang a salami. I'm a lasagna hog.\"\n",
"\n",
"print('case-insensitive functions ignoring punctuation characters')\n",
"%timeit palindrome_short(test_str)\n",
"%timeit palindrome_regex(test_str)\n",
"\n",
"print('\\n\\nfunctions considering all characters (case-sensitive)')\n",
"%timeit palindrome_reverse1(test_str)\n",
"%timeit palindrome_reverse2(test_str)\n",
"%timeit palindrome_recurs(test_str)\n"
],
"language": "python",
"metadata": {},
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{
"output_type": "stream",
"stream": "stdout",
"text": [
"case-insensitive functions ignoring punctuation characters\n",
"100000 loops, best of 3: 15.4 \u00b5s per loop"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"10000 loops, best of 3: 20.3 \u00b5s per loop"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"\n",
"\n",
"functions considering all characters (case-sensitive)\n",
"1000000 loops, best of 3: 508 ns per loop"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"100000 loops, best of 3: 3 \u00b5s per loop"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"1000000 loops, best of 3: 509 ns per loop"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 7
},
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