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                python中的struct方法,常常用進行網絡數據傳輸的過程中,制作固定長度的報頭,他可以將任意數字轉換為固定長度的二進制串`bytes` ### struct.pack(): `struct`的`pack`函數把任意數據類型變成`bytes`: 其函數原型為:struct.pack(fmt, v1, v2, ...),參數fmt是格式字符串,v1, v2, ...表示要轉換的python值。可以同時處理多個待轉換值: ``` >>> s='my name is luo gang' >>> l=len(s) >>> pg=struct.pack('i',l) #轉換成字節流,以便在網絡上傳輸 >>> print(len(pg)) #i表示int類型,正好4個字節長度 4 >>> print(pg) #二進制串 b'\x13\x00\x00\x00' ``` 參數常用的是`i`和`l`,分別可以表示不同極限的數字,一般用`i`足以 ?###?struct.unpack(): unpack用于將字節流反解回原始數據,反解回來的數據是一個元組, ``` >>> l1=struct.unpack('i',pg) >>> print(l1) (19,) >>> print(l1[0]) 19 ````
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