My function sits inside a .py file with the very same name as the function:
emp@emp:~$ python ~/Dropbox/emp/Python/stromkosten_pro_jahr.pyempedokles@empedokles:~$ stromkosten_pro_jahr(20,3)
bash: Syntaxfehler beim unerwarteten Wort »20,3«
emp@emp:~$
Where's the error?
You need to cd into the directory where your python file is located and then invoke the python interactive shell to be able to call and run functions interactively.
# cd to the directory
$ cd ~/Dropbox/emp/Python/
# invoke the python interactive shell
$ python # use `python3` to invoke the Python3 shell
The Python interactive shell would look something like:
Python 2.7.6 (default, Mar 22 2014, 22:59:38)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
Here you may import the module (your *.py file) and
run the functions written therein:
>>> from stromkosten_pro_jahr import stromkosten_pro_jahr
>>> stromkosten_pro_jahr(20,3)
[The output of function would be shown right here]
For more information, I would suggest to go through The Python Tutorial.
