How to import a module into another module

Question

This is the structure of my project:

project (folder)
   main.py
   assets (folder)
      a.py
      b.py

When I import module a into module b and run main.py, I get No module named 'a' .

Yet if I run b.py directly, it imports a.py just fine.

a and b are in the same directory, so what am I missing? FWIW, I am using Python 3.10.

main.py:

import assets.b as bb

a.py:

def func(x):
    print(x)

b.py:

import a
a.func('hello')

Answer 1

Update your b.py as follows

from . import a 
a.func('hello')

or

from assets import a
a.func('hello')

In first case, we are telling interpreter to check in the same location as file. In second case, we are just using a fullpath. Tested with python 3.10.1 and 3.6

If you are using a folder structure, it is always best to fix you execution path and relative path according to your main.py . Implies running python3.10 b.py from assets is not acceptable.

---

In case, you want the functionality to do python3.10 b.py from assets folder and also python3.10 main.py then update the code as follows.

try:
  from . import a
except:
  import a

a.func('hello')

If you are sticking to a IDE like PyCharm then such errors are easy to spot and fix.