how to input variable into a python script while opening from cmd prompt?

Question

I am wondering how would one get variables inputted in a python script while opening from cmd prompt? I know using c one would do something like:

int main( int argc, char **argv ) {
    int input1 = argv[ 0 ]
    int input2 = argv[ 1 ]

.....

}

how can I achieve the same kind of result in python?

You should probably check so that the number of arguments are at least 2 before trying to read to input2. — HelloGoodbye
– HelloGoodbye, Commented Jan 22, 2014 at 10:00

froadie · Accepted Answer · 2010-08-26 16:29:10Z

9

import sys

def main():
   input1 = sys.argv[1]
   input2 = sys.argv[2]
...

if __name__ == "__main__":
   main()

answered Aug 26, 2010 at 16:29

froadie

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Comments

Mad Scientist · Accepted Answer · 2010-08-26 16:25:53Z

3

The arguments are in sys.argv, the first one sys.argv[0] is the script name.

For more complicated argument parsing you should use argparse (for python >= 2.7). Previous modules for that purpose were getopts and optparse.

answered Aug 26, 2010 at 16:25

Mad Scientist

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Comments

Bill the Lizard · Accepted Answer · 2012-08-03 17:48:53Z

1

There are two options.

import sys.argv and use that.
Use getopts

Comments

Trigremm · Accepted Answer · 2015-10-31 10:37:48Z

0

it is also useful to determine option specific variables

''' \
USAGE:  python script.py -i1 input1 -i2 input2
    -i1 input1 : input1 variable
    -i2 input2 : input2 variable
'''

import sys 
...

in_arr = sys.argv
if '-i1' not in in_arr  or '-i2' not in in_arr:
    print (__doc__)
    raise NameError('error: input options are not provided')
else:
    inpu1 = in_arr[in_arr.index('-i1') + 1]
    inpu2 = in_arr[in_arr.index('-i2') + 1]
...

# python script.py -i1 Input1 -i2 Input2

edited Oct 31, 2015 at 10:37

answered Oct 31, 2015 at 10:27

Trigremm

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