Import module from subfolder in Python [duplicate]

Question

I want to import modules from subfolers in Python. It works from main.py to the subfolder, but not from subfolder to subfolder. Every folder has a __init__.py

This is how the folder structure looks like: Folder structure

I've created a little "class diagram", to show how it needs to be imported: Class diagram

main.py:

#! /usr/bin/env python

import os
from dotenv import load_dotenv
from os import path
from parser.Nfdump import Nfdump

def main():
    load_dotenv()
    
    p = Nfdump(os.getenv('flow_file_location'))
    p.Parse()

if __name__ == "__main__":
    main()

Nfdump.py

#! /usr/bin/env python

from types.Flow import Flow
from typing import NamedTuple
import ipaddress


class Nfdump:
    def __init__(self, file_location):
        self.file_location = file_location

    def Parse(self):
        ##parsing magic

Flow.py:

#! /usr/bin/env python
from typing import NamedTuple
import ipaddress

class Flow(NamedTuple):
    ip_source: ipaddress.ip_address
    port_source: int
    ip_dest: ipaddress.ip_address
    port_dest: int
    flags: str

Error thrown:

ModuleNotFoundError: No module named 'types.Flow'; 'types' is not a package

I am using Python 3 (3.10.2)

Answer 1

I think you should use relative imports. If I'm reading your hierarchy correctly, maybe the following:

In main:

from .parser.Nfdump import Nfdump

In Nfdump:

from ..types.Flow import Flow

The single dot means "one on the same level in the module hierarchy" and double dot means "one level up".