Convert bytes to int or int to bytes in python

def bytes_to_int(bytes):
 result = 0

 for b in bytes:
 result = result * 256 + int(b)

 return result

def int_to_bytes(value, length):
 result = []

 for i in range(0, length):
 result.append(value >> (i * 8) & 0xff)

 result.reverse()

 return result

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