变量名尽量不要和关键字相同，否则容易出歧义

变量名尽量不要和关键字相同，否则容易出歧义

 

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>>> xm ['zhang3', 'li4', 'wang5', 'zhao6'] >>> ' '.join(str(e) for e in xm) Traceback (most recent call last):   File "<pyshell#183>", line 1, in <module>     ' '.join(str(e) for e in xm)   File "<pyshell#183>", line 1, in <genexpr>     ' '.join(str(e) for e in xm) TypeError: 'str' object is not callable >>> str 'a' >>> del str    # 删除del变量 >>> str <class 'str'> >>> ' '.join(str(e) for e in xm) 'zhang3 li4 wang5 zhao6'