一种检查给定标识符的简单方法是否是关键字

问题描述 投票:0回答:1
'exit' in dir(_builtins_)
Traceback (most recent call last):
  File "<pyshell#125>", line 1, in <module>
    'exit' in dir(_builtins_)
NameError: name '_builtins_' is not defined
python python-3.x python-2.7
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