When does code in __init__.py get run?
Question:
I have read the documentation and there is something I’m still not sure about. Does all the initialisation code for the whole module in __init__.py get run if I do:
from mymodule import mything
or only if I do
import mymodule
What gets run from __init__.py and when does it get run?
I’m sure I could also test this fairly easy, but for posterity and helpfulness for others, I thought I’d ask here.
Answers:
The code in __init__.py is run whenever you import anything from the package. That includes importing other modules in that package.
The style of import (import packagename or from packagename import some_name) doesn’t matter here.
Like all modules, the code is run just once, and entered into sys.modules under the package name.
I have read the documentation and there is something I’m still not sure about. Does all the initialisation code for the whole module in __init__.py get run if I do:
from mymodule import mything
or only if I do
import mymodule
What gets run from __init__.py and when does it get run?
I’m sure I could also test this fairly easy, but for posterity and helpfulness for others, I thought I’d ask here.
The code in __init__.py is run whenever you import anything from the package. That includes importing other modules in that package.
The style of import (import packagename or from packagename import some_name) doesn’t matter here.
Like all modules, the code is run just once, and entered into sys.modules under the package name.