Is this possible to modify python packages with python shell?

Asked Jun 19 '16 at 11:35

Active Jun 19 '16 at 12:53

Viewed 61 times

Let’s say I have a python package like this :

my-python-package/
    __init__.py
    app.py

__init__.py is empty and it is just for telling python that we have a python package. And app.py is this :

FAVORITE_COLORS = ['blue', 'purple']

Here is the idea, I want to append another color to this list using python shell. I started from changing directory, so we can simply import app.py :

>>> import os
>>> os.chdir('C:\Users\Javad\Desktop\my-python-package')
>>> os.getcwd()
'C:\\Users\\Javad\\Desktop\\my-python-package'

After that, We do our general task :

>>> import app
>>> app.FAVORITE_COLORS
['blue', 'purple']
>>> app.FAVORITE_COLORS.append('red')
>>> app.FAVORITE_COLORS
['blue', 'purple', 'red']

According to what we see in python shell, ‘red’ successfully appended to the app.FAVORITE_COLORS. But when you open app.py, it’s exactly the same before modify :

FAVORITE_COLORS = ['blue', 'purple']

I would be appreciated if someone explains what’s happened. Thank you.

asked Jun 19 '16 at 11:35

Uncle

I tried to explain complete but if you need further information leave a comment please. – Uncle Jun 19 '16 at 12:05
You load app. You can modify your app attributes, but you aren't doing anything to the file where app was loaded from – joel goldstick Jun 19 '16 at 12:35
@joelgoldstick what is the solution ? – Uncle Jun 20 '16 at 07:45
@Uncle no you can't do that. – wind85 Jun 20 '16 at 08:13
@wind85 why ? always must be a way! – Uncle Jun 20 '16 at 08:19
2

@Uncle of course there is a way, but you can't do that with an import statement, you shuold serialize and deserialize the file you modify or class. Have a look at the pickle https://docs.python.org/3.5/library/pickle.html. – wind85 Jun 20 '16 at 08:27
I would be appreciated if the other guys share their opinion too. – Uncle Aug 04 '16 at 23:20

Is this possible to modify python packages with python shell?

0 Answers0