Is there a reason this implementation was chosen?

[M15terHyde]

aioquic/src/aioquic/tls.py

Line 1223 in 7b3f24b

message_length = (message_length << 8) | b

I understand it's shifting each byte onto the right to recreate the integer of the message_length but why reinvent the wheel when python integers already have int.from_bytes.
Was there a reason:

message_length = 0
message_length.from_bytes( self._receive_buffer[1:4], byteorder='big' )

was not chosen?

[jlaine]

Hah good catch, I'm guessing it's just me not knowing the standard library inside out!

message_length = 4 + int.from_bytes(buffer[1:4], byteorder="big")

Here is a PR which makes use of int.from_bytes and int.to_bytes:

#312