what is the meaning of this python code: <L in struct.pack("<L",self.src)

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My problem is to understand the meaning of: <L in this python code:

self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
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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()