Why is my Python script not running via command line?

Question

Thanks!

def hello(a,b):
    print "hello and that's your sum:"
    sum=a+b
    print sum
    import sys

if __name__ == "__main__":
hello(sys.argv[2])

It does not work for me, I appreciate the help!!! Thanks!

Answer 1

Without seeing your error message it's hard to say exactly what the problem is, but a few things jump out:

• No indentation after if __name__ == "__main__":
• you're only passing one argument into the hello function and it requires two.
• the sys module is not visible in the scope outside the hello function.

probably more, but again, need the error output.

Here's what you might want:

import sys

def hello(a,b):
    print "hello and that's your sum:"
    sum=a+b
    print sum

if __name__ == "__main__":
    hello(int(sys.argv[1]), int(sys.argv[2]))

Answer 2

• Import sys in global scope, not in the end of the function.
• Send two arguments into hello, one is not enough.
• Convert these arguments to floats, so they can be added as numbers.
• Indent properly. In python indentation does matter.

That should result in:

import sys

def hello(a, b):
    sum = a + b
    print "hello and that's your sum:", sum

if __name__ == "__main__":
    hello(float(sys.argv[1]), float(sys.argv[2]))