myopy

Run blind python files.

This single class package, provides python objects to a python file at run time. This is ideal for configuration files where the user does not need to know where an object comes from or how to initialize it. It allows the python file to be blind to the origin of it's objects, removing the need for imports, object initializations or convoluted subclassing.

This is pretty much a standalone clone of the way the amazing qutebrowser handles it's config files.

Feel free to copy paste the PyFile class if you don't want the added dependency.

Installation

pip install myopy

Usage

Say you want to allow the user to change a dict containing some settings for an application in a configuration file called config.py:

In the application you would have something along the lines of:

from myopy import PyFile

user_dict = {'something': 2}

config = PyFile('path/to/config.py')
# we provide the config file the user_dict in the 'settings' variable
config.provide(settings=user_dict)
module = config.run()  # returns a module object
print('after running config: ', user_dict)
print('module: ', module)

And in the user facing config.py, the user_dict object would be provided in the settings variable, and the user can change its values at will:

print('in config: ', settings)
settings['something_else'] = 4
settings['something'] = 3

The output would be:

in config: {'something': 2}
after running config: {'something': 3, 'something_else': 4}
module: <module 'config' from 'path/to/config.py'>

the user_dict is modified in place.