Struct Module

This module performs conversions between Python values and C structs represented as Python strings.

pack( fmt, v1, v2, ...) - Return a string containing the values v1, v2, ... packed according to the given format. The arguments must match the values required by the format exactly.
unpack( fmt, string) - Unpack the string (presumably packed by pack(fmt, ...)) according to the given format.
calcsize( fmt) - Return the size of the struct (and hence of the string) corresponding to the given format.

    pack('hhl', 1, 2, 3)   # '\x00\x01\x00\x02\x00\x00\x00\x03'
    unpack('hhl', '\x00\x01\x00\x02\x00\x00\x00\x03')   # (1, 2, 3)
    calcsize('hhl')   # 8

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