The format-string "<L" in the expression struct.pack("<L",self.src) means that pack interpretes the value in self.src as little-endian ordered unsigned long value. The endianess is a convention, which determines in which direction a sequence of bits are interpreted as a number: from (Big-endian) left to right, or from (Little-endian) right to left.
Afterwards the unsigned long number is conterted to standard dotted-quad string representation via socket.inet_ntoa()
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solved what is the meaning of this python code: