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import struct
str = '0123456789'
str_size = len(str) # 10
# 打包
str_key = struct.pack('i', str_size)
print('打包',str_key)
# 解包
data_size = struct.unpack('i', str_key)
print('解包',data_size)
‘’‘
打包 b'\n\x00\x00\x00'
解包 (10,)
’‘’
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