IndexError: list index out of range

Question

beginner in python, please take a look at the below code:

import sys
if __name__ == '__main__':

     n = int(sys.argv[1]) 
     i=1
     s=0
     while i<n:
            if (i % 3 == 0 and i % 5 == 0): 
                pass
            elif (i % 3 == 0): 
                s = s+i
            elif (i % 5 == 0):
                s = s+i 
            i=i+1
     print 'The sum is of all 3s and 5s till {}: {}'.format(n,s)

The error keeps coming out, I don't know how to solve it:

      2 import sys
      3 if __name__ == '__main__':
----> 4     n = int(sys.argv[1])
      5     i=1
      6     s=0

IndexError: list index out of range

Thank you!

i can do that in terminal, but can i also do that in canopy? — Albert Yu
– Albert Yu, Commented Feb 2, 2017 at 21:28
@AlbertYu try this script import sys if __name__ == '__main__': print sys.argv and run python script.py 1. after this run python script.py 1 2 3 and you will understand how it works — Danila Ganchar
– Danila Ganchar, Commented Feb 2, 2017 at 21:30

Uriel · Accepted Answer · 2017-02-02 21:26:21Z

1

You need to send at least one argument when calling the program (call it like > euler_1.py 1000), since the arguments are stored in sys.argv[1:].

You can avoid this need by setting a default when no argument is supplied:

n = int(sys.argv[1]) if len(sys.argv) > 1 else 1000

answered Feb 2, 2017 at 21:26

Uriel

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2 Comments

Albert Yu Over a year ago

but i only have one input argument here

Uriel Over a year ago

sys.argv[0] is the name of the program, arguments start from index 1

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