Python – Python imported the package, and the properties reported an error

I’m new to Python and I want to understand how package and import statements work.
I made this package, located on my desktop :

package/
   __ init __.py
   module2.py
   subpackage1/
      __ init __.py
      module1.py

This is the contents of __ init __ .py in the package folder:

__ all __ =["module2"]
import os
os.chdir("C:/Users/Leo--/Desktop/Package")
import subpackage1.module1
os.chdir("C:/Users/Leo--/Desktop")

In __ init __ .py in the subpackage1 folder:

__ all __ =["module1"]

I just want to import module1.py and module2.py by writing

import package

After entering the above command in the interpreter, I can access any function of module1.py without any problem by writing

it

package.subpackage1.module1.mod1()

where mod1() is the function defined in module1.py.
But when I type

package.module2.mod2()

I get “AttributeError: module ‘package’ does not have attribute ‘module2′” (mod2() is a function defined in module2.py).
Why is that?
Thanks in advance!

You receive AttributeError because you have not imported module2 in the __init__.py file.

You should not execute os.chdir() in __init__.py to import submodules.

I’ll do it :

__ init __.py in the package directory.

from . import module2
from . import subpackage

__ init __.py in the subpackage1 directory.

from . import module1