「Python」- int

>>> b'\xde\xad\xbe\xef'.hex() # bytes => hex
'deadbeef'

>>> bytes.fromhex('deadbeef') # hex => bytes
b'\xde\xad\xbe\xef'

int("deadbeef", 16)  # 3735928559
int("0xdeadbeef", 0)  # 如果包含 0x 前缀，则无需指定进制

>>> hex(16)
'0x10'