96. Passing arguments to Python from the command line (or other programs)

Many Python programs have all the variables defined within the Python code (or the Python code reads input files). It my be useful at times, however, to be able to pass one or more arguments to Python when calling the program from the command line or another programme. This is simple in Python. Below is an example (saved as ‘mycode.py’) that takes two arguments and multiplies them together:

import sys

x,y = int(sys.argv[1]), int(sys.argv[2])

print (x * y)

Now we can call that from the command line, passing our variables:

python mycode.py 3 4

>12

This type of code may allow us to write generic Python code, and call it as part of an automated sequence from another piece of code which passes the required variables to Python.

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