Python script to create and break apart CTR service command headers

cmdHeader.py

#!/bin/env python3
from sys import argv, exit

comamndId = 0
normalParams = 0
translateParams = 0
headerCode = 0

if len(argv) == 1:
    print("""cmdHeader.py v1.0
2016 TheReturningVoid
=====================
Usage:
  cmdHeader.py [headerCode]
OR
  cmdHeader.py [commandId] [normalParameters] [translateParameters]""")
    exit(0)
elif len(argv) == 2:
    commandId = int(argv[1], 16) >> 16
    normalParams = (int(argv[1], 16) >> 6) & 31
    translateParams = int(argv[1], 16) & 31
    headerCode = int(argv[1], 16)
elif len(argv) == 4:
    commandId = int(argv[1], 16)
    normalParams = int(argv[2], 16)
    translateParams = int(argv[3], 16)
    headerCode = (commandId << 16) | ((normalParams & 0x3F) << 6) | (translateParams & 0x3F)
else:
    raise ValueError("Invalid amount of parameters specified!")

print("Header code:                     0x%s" % hex(headerCode)[2:].upper())
print("Command ID:                      0x%s" % hex(commandId)[2:].upper())
print("Amount of normal parameters:     0x%s" % hex(normalParams)[2:].upper())
print("Amount of translateParameters:   0x%s" % hex(translateParams)[2:].upper())