一、python3.6中的：
共33个关键字：
通过导入keyword模块，查看python所有的关键字。在ipython中：
Python 3.6.0 |Anaconda 4.3.1 (64-bit)| (default, Dec 23 2016, 11:57:41) [MSC v.1900 64 bit (AMD64)]Type "copyright", "credits" or "license" for more information.
IPython 5.1.0 -- An enhanced Interactive Python.? -> Introduction and overview of IPython's features.%quickref -> Quick reference.help -> Python's own help system.object? -> Details about 'object', use 'object??' for extra details.
In [1]: import keyword
In [2]: dir(keyword)Out[2]:['__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'iskeyword', 'kwlist', 'main']
In [3]: keyword.iskeywordOut[3]: <function frozenset.__contains__>
In [4]: keyword.iskeyword?Docstring: x.__contains__(y) <==> y in x.Type: builtin_function_or_method
二、python2.7中的：
共31个关键字
[zqf@zengqingfu ~]$ ipythonPython 2.7.13 |Anaconda custom (64-bit)| (default, Dec 20 2016, 23:09:15) Type "copyright", "credits" or "license" for more information.
IPython 5.1.0 -- An enhanced Interactive Python.? -> Introduction and overview of IPython's features.%quickref -> Quick reference.help -> Python's own help system.object? -> Details about 'object', use 'object??' for extra details.
In [2]: import keyword
In [3]: keyword.kwlistOut[3]: ['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']
In [4]: dir(keyword)Out[4]: ['__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', 'iskeyword', 'kwlist', 'main']
三、区别：
python3 相比python2的关键字，减 少了print和exec这两个关键字， 但是新增了False,None,True,nonlocal这4个关键字。
转载于:https://www.cnblogs.com/zengqingfu1442/p/7257645.html
