How to pass a variable as a command line argument in iPython?

Question

For example, I have a Python module and a iPython module,

cmd.py

import sys
print sys.argv

test.ipynb

for i in range(5):
   %run cmd.py i

When I run test.ipynb, it just print ['cmd.py', 'i'] multiple times. How can I pass the value of i instead of 'i' as a command line argument?

have you tried %run cmd.py $i ?

Jean-François Fabre
– Jean-François Fabre ♦

2017-01-06 14:44:32 +00:00
Commented Jan 6, 2017 at 14:44 — Jean-François Fabre
– Jean-François Fabre ♦, Commented Jan 6, 2017 at 14:44

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

the shell mode interprets everything literally (else cmd.py would be evaluated as well). I would just do:

for i in range(5):
   %run cmd.py $i

from http://ipython.readthedocs.io/en/stable/interactive/reference.html

IPython also allows you to expand the value of python variables when making system calls. Wrap variables or expressions in {braces}:

For simple cases, you can alternatively prepend $ to a variable name

edited Jun 20, 2020 at 9:12

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answered Jan 6, 2017 at 14:47

Jean-François Fabre♦

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1 Comment

Jean-François Fabre Over a year ago

I must admin I spent at least 15 minutes in the documentation to find the information. Wasn't the most accessible piece of information :)

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