Running a Python function in BASH-CodePudding

I usually run Python on Google Colab, however I need to run a script in the terminal in Ubuntu.

I have the following script test.py:

#!/usr/bin/env python

# testing a func

def hello(x):
  if x > 5:
    return "good"
  else:
    return "bad"

hello(2)

When executed it fails to return anything. Now I could just replace the return statements with a print statement. However, for other scripts I have, a return statement is needed.

I tried:

python test.py

You see, on Google Colab, I can simply call the function (hello(2)) and it will execute.

Desired output:

> python test.py
> bad

CodePudding user response：

You don't print anything to STDOUT so you won't see the good/bad in your terminal.

You should change hello(2) line to print(hello(2)) in your code (In this case the return value of hello(2) function call will be printed to STDOUT file descriptor) then you will see your result in your terminal.

CodePudding user response：

In case you want to sent the argument when calling the script you could do it like this:

#!/usr/bin/env python
import sys

def hello(x):
    if x > 5:
        return "good"
    else:
        return "bad"

 print(hello(int(sys.argv[1])))

And so you could call the function like so:

python test.py 6

Then the output would be:

> python test.py 6
> good