Importing issues with base class for inheritance

[riccardoob]

To understand how it works you need to have some basic notions of how import statements work. When it executes say import food_bot.price, Python looks in the dictionary sys.modules if it already contains a module named food_bot.price. If it is not the case, a new empty module object is created an inserted immediately in sys.modules. Then Python starts executing in this module's namespace the code that in finds in __init__.py. There it encounters the line from .pricing import Pricing. It inserts immediately a module named food_bot.price.pricing in sys.modules and it executes the code of pricing.py in that module's namespace. After that, this module contains the class named Pricing and Python can complete the import. At that point, the module food_bot.price exists and contains the name Pricing.

Then Python runs from .item_pricing import ItemPricing. This executes the code from item_pricing.py in a new module's namespace. That code contains the line from . import Pricing. The . module here is food_bot.price which is already in sys.modules and already contains the symbol Pricing. Hence the line suceeds.

Thanks a lot!