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Command Line Arguments in Python

Last updated on May 22,2019 13.6K Views

Python supports the creation of programs that can be run on the command line, completely with command-line arguments. It provides a getopt module, with which command line options and arguments can be parsed.

Accessing Command Line Arguments

The Python sys module provides access to any of the command-line arguments via sys.argv. It solves two purposes:

  • sys.argv is the list of command line arguments
  • len(sys.argv) is the number of command line arguments that you have in your command line
  • sys.argv[0] is the program, i.e. script name

Executing Python

You can execute Python in this way:

$python Commands.py inp1, inp2 inp3

Example

Inside Commands.py:

import sys

print ‘Number of arguments:’, len (sys.argv), ‘arguments.’

print ‘Argument List:’, str(sys.argv)

It will produce the following output:

Number of arguments: 4 arguments.

Argument List: [‘sample.py’, ‘inp1’, ‘inp2’, ‘inp3’]

Note: One thing to remember here is that indentation and spacing is extremely important, otherwise it may give error or incorrect number of arguments.

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