Python struct Library

The socket library of ython uses the string type to send and receive data, so that when we use

I = socket. Recv (4)

To receive a 4-byte integer, the integer is actually saved in binary form in the string I
In most cases, we need a real integer/long type instead of an integer in the string type. In this case, we can use struct
Library: interpret strings as packed binary data. For the above situation, we can write

T = unpack ("I", I)

The first parameter is a formatted string. I indicates that the first data item contained in string I is an integer in the C language unsigned integer. Here I
Only one data item is included. In fact, the interpreted string can contain multiple data items. You only need to specify a format for each data item in the formatted string. Naturally, unpack returns
A tuple type.