Python3中str、bytes、bytearray轉化的方法是什么

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簡介

str是采用Unicode編碼方式的序列，主要用于顯示
bytes是字節序列，主要用于網絡和文件傳輸
bytearray和bytes是一樣的，只是它是可變的，它們的關系和str與list類似

str和bytes的相互轉化就是編碼和解碼

str轉bytes

使用函數encode

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

bytes轉str

使用函數decode

In [6]: s2 = b.decode("utf-8")                                                                                                                                           
In [7]: print(s2)                                                                                                                                                        
123abc456ffff
In [8]:

如果是定義一個bytes：

b = b'123abc456ffff'

bytes和str轉化為bytearray

bytes和str轉化為bytearray都依賴于bytearray函數

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字符串轉為bytearray

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

bytearray轉為str和bytes

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

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