command line arguments to add two numbers in python

Question

I've been trying to add two numbers using command line arguments... This is as far as I found on this site about adding 2 numbers using command arguments

import sys
a=sys.argv[1:]
b=sys.argv[2:]
sumn=str(a+b)
print(" sum is",sumn)

remove the columns when subscripting the sys.argv array, and cats to int — TDk
– TDk, Commented Sep 25, 2017 at 9:25
Please take a look at your individual results! For example print out sys.argv[1:] to see what you are doing. You should really learn to understand the code you are copying from elsewhere. — poke
– poke, Commented Sep 25, 2017 at 9:26

TDk · Accepted Answer · 2017-09-25 09:41:35Z

3

You need to cast to int and subscript direct values, not slices

import sys
if len(sys.argv) > 2:
    try:
        a = int(sys.argv[1])
        b = int(sys.argv[2])
        print("sum = %d" % (a + b))
    except ValueError:
        print("failed to parse all arguments as integers.")
        exit(1)
else:
    print("Not enough numbers to add")

EDIT: Added error handling as mentioned in the comments

edited Sep 25, 2017 at 9:41

answered Sep 25, 2017 at 9:27

TDk

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1 Comment

PhillipD Over a year ago

Maybe you add some code to handle a possible ValueError when the user enters a string that cannot be casted to an integer to make your answer complete.

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