Python3中str、bytes、bytearray转化的方法是什么

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简介

str是采用Unicode编码方式的序列，主要用于显示
bytes是字节序列，主要用于网络和文件传输
bytearray和bytes是一样的，只是它是可变的，它们的关系和str与list类似

str和bytes的相互转化就是编码和解码

str转bytes

使用函数encode

In [2]: s1 = "123abc456ffff"                                                                                                                                                                                                                                                           In [4]: b = s1.encode("utf-8")                                                                                                                                                  In [5]: print(b)                                                                                                                                                         b'123abc456ffff'In [6]:

bytes转str

使用函数decode

In [6]: s2 = b.decode("utf-8")                                                                                                                                           In [7]: print(s2)                                                                                                                                                        123abc456ffffIn [8]:

如果是定义一个bytes：

b = b'123abc456ffff'

bytes和str转化为bytearray

bytes和str转化为bytearray都依赖于bytearray函数

bytes --> bytearray

In [8]: b = b'dafafasfasfsad22136436'In [10]: s1 = bytearray(b) In [11]: print(s1)                                                                                                                                  bytearray(b'dafafasfasfsad22136436')In [12]:

str–>bytearray

In [8]: b = 'dafafasfasfsad22136436'In [10]: s1 = bytearray(b) In [11]: print(s1)                                                                                                                                  bytearray(b'dafafasfasfsad22136436')In [12]:

hex字符串转为bytearray

In [12]: hexs = "1289"                                                                                                                              In [13]: br = bytearray.fromhex(hexs)                                                                                                               In [14]: print(br)                                                                                                                                  bytearray(b'\x12\x89')In [15]:

bytearray转为str和bytes

byarray=bytearray("aabbcc",encoding='utf-8')str=byarray.decode('utf-8')bytes=bytes(byarray)print (byarray)bytearray(b'aabbcc')print(str)aabbccprint(bytes)b'aabbcc'

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