python2和python3中str,bytes区别

python2中，有basestring、str、bytes、unicode四种类型

其中str == bytes ,basestring = (str,unicode)

>>> isinstance('s',str)

True

>>> isinstance('s',bytes)

True

>>> isinstance('s',unicode)

False

>>> isinstance('s'.decode(),unicode)

True

>>> isinstance('s'.decode(),basestring)

True

>>> isinstance('s',basestring)

True

python3中，有str和bytes类型

>>> isinstance('s',str)

True

>>> isinstance('s',bytes)

False

>>> isinstance('s',unicode)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'unicode' is not defined

>>> isinstance(b's',bytes)

True

>>> isinstance('s',basestring)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

NameError: name 'basestring' is not defined

巴特西

python2和python3中str,bytes区别

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