How do I open another Python file within a file with a parameter/argument/variable attached?

Question

I want to run another file from my main.py and also set the value of a variable in the main.py and "export it", so I can use it in the other file. But I absolutely don´t know how to do that. So that I can set a 'var = x[3]' in the main file and kinda "export" the variable into the file that I am opening like 'import otherfile.py(var = x[3])'

Thanks in advance

Answer 1

To import any variable from main file to otherfile you can use,

from main import*
Y = var 

That's how you can set var in main.py file and import or use it in otherfile.py.

Answer 2

You can use sys.argv to get arguments if you run the file from the command line so if you have the file:

import sys
print(sys.argv[0])

then open a command line and type python file.py hello it will print 'hello'.

As well, you can use os.system() to run command line functions from python so your first file could be:

import os
var = 'test'
os.system(f"python otherfile.py {var}")

and otherfile.py could be:

import sys
print(sys.argv[0])

then if you run the first file, a python window will open and print 'test'. Hope this was what you were looking for