python3的二進制轉(zhuǎn)文本問題

yanu

事情是這樣的: struct.pack在python3上返回個bytes,我試著解碼成utf-8 或者ascii都報錯,這可咋辦

在python2上:

1. >>> msg = struct.pack("I",socket.htonl(len(text))) + text
   
2. >>>
   

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在python3上:

1. >>> msg = struct.pack("I",socket.htonl(len(text))) + text
   
2. Traceback (most recent call last):
   
3.   File "<stdin>", line 1, in <module>
   
4. TypeError: can't concat bytes to str
   
5. >>>
   

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1. >>> struct.pack("<I",socket.htonl(len(text))).decode('utf-8')
   
2. Traceback (most recent call last):
   
3.   File "<stdin>", line 1, in <module>
   
4. UnicodeDecodeError: 'utf-8' codec can't decode byte 0xac in position 3: invalid start byte
   

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1. 
   
2. >>> struct.pack("<I",socket.htonl(len(text))).decode('ascii')
   
3. Traceback (most recent call last):
   
4.   File "<stdin>", line 1, in <module>
   
5. UnicodeDecodeError: 'ascii' codec can't decode byte 0xac in position 3: ordinal not in range(128)
   
6. >>>
   

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yanu

  把str轉(zhuǎn)成bytes再拼接，居然過了,后面的功能貌似也沒受影響

1. msg = struct.pack("I",socket.htonl(len(text))) + text.encode()

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