I have a Python function, fooPy() that returns some value. ( int / double or string)
I want to use this value and assign it in a shell script. For example following is the python function:
def fooPy(): return "some string" #return 10 .. alternatively, it can be an int fooPy()
In the shell script I tried the following things but none of them work.
fooShell = python fooPy.py fooShell = $(python fooPy.py) fooShell = echo "$(python fooPy.py)"
You can print your value in Python, like this:
and in your shell script:
Be sure not to leave spaces around the
= in the shell script.
In your Python code, you need to print the result.
import sys def fooPy(): return 10 # or whatever if __name__ == '__main__': sys.stdout.write("%sn", fooPy())
Then in the shell, you can do:
fooShell=$(python fooPy.py) # note no space around the '='
Note that I added an
if __name__ == '__main__' check in the Python code, to make sure that the printing is done only when your program is run from the command line, not when you import it from the Python interpreter.
I also used
sys.stdout.write() instead of
- in “real programs”, one should use
If you want the value from the Python
sys.exit statement, it will be in the shell special variable
$ var=$(foo.py) $ returnval=$? $ echo $var Some string $ echo returnval 10
fooPy. The shell substitution reads from stdout. Replace the last line of your program with
print fooPy() and then use the second shell pipeline you’ve mentioned. It should work.