a_python_program.py

#!/usr/bin/python

import math, sys                  #  Importing modules.

def formatresult(res):            # Define function. Remember colon!
    """This is the documentation for a function."""
    return "The result is %f" % res  # Percentage for formating

if len(sys.argv) < 3:              # Conditionals should be indended
    print("Too few input argument")
elif len(sys.argv) > 10:   # Not 'elsif' or 'elseif' 
    print("Too many input argument")
else: 
    res = 0;        # Semicolon not necessary. Considered bad style
    for n in range(1, len(sys.argv)):    # Not first element in loop
        try: res += float(sys.argv[n])   # One-liner: no identation
        except: pass  # One-liner!
    print(formatresult(res))