🔒 Unexpected ModuleNotFound

[light night]

└── main/
    ├── __init__.py
    ├── one.py
    └── sub/
        ├── __init__.py
        └── two.py

#one.py
from sub.two import Class

resource = 3

#two.py
from main import one

print(one.resource)

class Class:
    pass

When I execute one.py how come it raises ModuleNotFoundError: No module named 'main'?

[lone bear]

@light night

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[white breach]

Show the full terminal session?

You need main.sub.two

[light night]

Traceback (most recent call last):
  File "d:\vsc\test\main\one.py", line 1, in <module>
    from sub.two import Class
  File "d:\vsc\test\main\sub\two.py", line 1, in <module>
    from main import one
ModuleNotFoundError: No module named 'main'

[glass basalt]

Which command did you use to run this?

[light night]

from main.sub.two import Class

resource = 3

Still doesnt work

[light night]

Just clicked run on vsc

PS D:\vsc\test> & C:/Users/no/AppData/Local/Programs/Python/Python312/python.exe d:/vsc/test/main/one.py

[white breach]

Ah don't use run on vscode

Use python -m main.one

[light night]

Nice! It works thanks!

What does that do exactly?

[modern night]

runs it as a module

[light night]

So basically importing it?

[modern night]

not necessarily

[sage swift]

There's two ways to run code in python: as a script or as a module

[light night]

What does running it as a module do differently?

[sage swift]

When you do python one.py it runs "one.py" within the main directory. Everything above that level, including main, is inaccessible

[light night]

ohh

[sage swift]

When you do python -m main.one it runs the directory main as the module, importing the __init__, and then runs one.py underneath that. Because main is part of the project namespace from that perspective, you can import it

By default python -m main also runs __main__.py, but you dont' have one, hence the need to specify .one

[light night]

and it has acess to everything else including sub

[sage swift]

right

Everything at the level you're running, and below

[light night]

Ok that makes sense now

Thanks guys!

!close

[lone bear]

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