How to use argparse to grab command line arguments in Python?

Question

I want to be able to save integer values after an option is passed through the command line. Ideally it would be:

python thing.py -s 1 -p 0 1 2 3 -r/-w/-c

-s - store the following integer
-p - store the following integers

The final part can be only one of the three options (-r, -w, or -c), depending on what it is I need to do.

I've been trying to read tutorials but they all use the same two examples that don't explain how to store integers after a -option.

If the last part should be exactly one of three, you may want to make it a required positional argument, like commands in many other tools (e.g. install of apt-get). — user395760
– user395760, Commented Jun 10, 2011 at 16:48

Wooble · Accepted Answer · 2011-06-10 17:18:25Z

4

>>> import argparse
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('-s', type=int)
[...]
>>> parser.add_argument('-p', type=int, nargs='*')
[...]
>>> group = parser.add_mutually_exclusive_group(required=True)
>>> group.add_argument('-r', action='store_true')
[...]    
>>> group.add_argument('-w', action='store_true')
[...]    
>>> group.add_argument('-c', action='store_true')
[...]    
>>> parser.parse_args("-s 1 -p 0 1 2 3 -r".split())
Namespace(c=False, p=[0, 1, 2, 3], r=True, s=1, w=False)

answered Jun 10, 2011 at 17:18

Wooble

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