Python2 和 Python3 字符串的区别

Python2

>>>
>>> isinstance(b‘abc‘, bytes)
True
>>>
>>> isinstance(b‘abc‘, str)
True
>>>
>>> isinstance(‘abc‘, str)
True
>>>
>>> isinstance(‘abc‘, bytes)
True
>>>
>>>
>>>
>>> ‘abc‘.startswith(‘ab‘)
True
>>>
>>> b‘abc‘.startswith(‘ab‘.encode())
True
>>>
>>> b‘abc‘.startswith(‘ab‘)
True
>>>
>>> ‘abc‘.startswith(‘ab‘.encode())
True
>>> 

Python3

>>>
>>> isinstance(b‘abc‘, bytes)
True
>>>
>>> isinstance(b‘abc‘, str)
False
>>>
>>> isinstance(‘abc‘, str)
True
>>>
>>> isinstance(‘abc‘, bytes)
False
>>>
>>>
>>>
>>> ‘abc‘.startswith(‘ab‘)
True
>>>
>>> b‘abc‘.startswith(‘ab‘.encode())
True
>>>
>>> b‘abc‘.startswith(‘ab‘)
Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    b‘abc‘.startswith(‘ab‘)
TypeError: startswith first arg must be bytes or a tuple of bytes, not str
>>>
>>> ‘abc‘.startswith(‘ab‘.encode())
Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    ‘abc‘.startswith(‘ab‘.encode())
TypeError: startswith first arg must be str or a tuple of str, not bytes
>>> 

原文地址：https://www.cnblogs.com/moonlight-lin/p/12237146.html