文件 十六进制 互转

import sys,os
def main():
    args = sys.argv
    if len(args) < 2:
        return "Usage: python xx.py filePath encode/decode"
    if not os.path.exists(args[1]):
        return "Usage: python xx.py filePath encode/decode"
    if args[2] == 'encode':
        fileName = args[1]
        fileName_new = fileName + ".hexEncode"
        with open(fileName,"rb") as f:
            with open(fileName_new,'w',encoding="utf-8") as f2:
                f2.write(bytes.hex(f.read()))
    elif args[2] == 'decode':
        fileName = args[1]
        fileName_new = fileName + ".hexDecode"
        with open(fileName,"r",encoding="utf-8") as f:
            with open(fileName_new,'wb') as f2:
                f2.write(bytes.fromhex(f.read()))
    else:
        return "Usage: python xx.py filePath encode/decode"
    return "success"
if __name__ == "__main__":
    print(main())