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a is b oddity explained

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rasbt 2014-04-15 14:18:42 -04:00
parent 96f7d72972
commit ff938c4ac7
2 changed files with 15 additions and 9 deletions
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14
.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb
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@ -1,7 +1,7 @@
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"name": "", "name": "",
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@ -13,7 +13,9 @@
"metadata": {}, "metadata": {},
"source": [ "source": [
"Sebastian Raschka \n", "Sebastian Raschka \n",
"last updated: 04/15/2014" "last updated: 04/15/2014\n",
"\n",
"[Link to this IPython Notebook on GitHub](https://github.com/rasbt/python_reference/blob/master/not_so_obvious_python_stuff.ipynb)"
] ]
}, },
{ {
@ -38,7 +40,7 @@
"- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n", "- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n",
"- [The behavior of += for lists](#pm_in_lists)\n", "- [The behavior of += for lists](#pm_in_lists)\n",
"- [`True` and `False` in the datetime module](#datetime_module)\n", "- [`True` and `False` in the datetime module](#datetime_module)\n",
"- [Some Python Oddity that I cannot explain, yet](#python_oddity)\n", "- [Python reuses objects for small integers](#python_small_int)\n",
"- [Shallow vs. deep copies if list contains other structures and objects](#shallow_vs_deep)\n", "- [Shallow vs. deep copies if list contains other structures and objects](#shallow_vs_deep)\n",
"- [Picking True values from and and or expressions](#false_true_expressions)" "- [Picking True values from and and or expressions](#false_true_expressions)"
] ]
@ -186,8 +188,10 @@
"source": [ "source": [
"<br>\n", "<br>\n",
"<br>\n", "<br>\n",
"<a name='python_oddity'></a>\n", "<a name='python_small_int'></a>\n",
"## Some Python Oddity that I cannot explain, yet" "## Python reuses objects for small integers \n",
"\n",
"This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!"
] ]
}, },
{ {

10
not_so_obvious_python_stuff.ipynb
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@ -1,7 +1,7 @@
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@ -40,7 +40,7 @@
"- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n", "- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n",
"- [The behavior of += for lists](#pm_in_lists)\n", "- [The behavior of += for lists](#pm_in_lists)\n",
"- [`True` and `False` in the datetime module](#datetime_module)\n", "- [`True` and `False` in the datetime module](#datetime_module)\n",
"- [Some Python Oddity that I cannot explain, yet](#python_oddity)\n", "- [Python reuses objects for small integers](#python_small_int)\n",
"- [Shallow vs. deep copies if list contains other structures and objects](#shallow_vs_deep)\n", "- [Shallow vs. deep copies if list contains other structures and objects](#shallow_vs_deep)\n",
"- [Picking True values from and and or expressions](#false_true_expressions)" "- [Picking True values from and and or expressions](#false_true_expressions)"
] ]
@ -188,8 +188,10 @@
"source": [ "source": [
"<br>\n", "<br>\n",
"<br>\n", "<br>\n",
"<a name='python_oddity'></a>\n", "<a name='python_small_int'></a>\n",
"## Some Python Oddity that I cannot explain, yet" "## Python reuses objects for small integers \n",
"\n",
"This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!"
] ]
}, },
{ {