input: Write a python function to print the first argument from the command line.
  assert sys_argv_first_argument(["script_name", "hello", "world"]) == "hello"
  assert sys_argv_first_argument(["script_name", "Python"]) == "Python"
  assert sys_argv_first_argument(["script_name", "test", "case"]) == "test"
output: def sys_argv_first_argument(argv):
      return argv[1]