Put folders in sys path so Python 3 can find them

Problem: I want to import a file in the same folder

Problem 2: I want to import a file from a subfolder

Solution: Add folder path to Python’s sys.path

Sample layout

my_package
|
|----__init__.py
|----myapp.py
|----client.py
|----/utils
|--------__init__.py
|--------client_tools.py

With the following pattern in myapp.py

from client import ClientClass

Yet Python will argue

ModuleError: No module named 'client'

Yet clearly client.py is right there in the same folder. What gives?

Solution: Add info to the folder’s init.py

For each folder having Python files in them, add the following to the init files:

import os, sys
sys.path.append(os.path.dirname(os.path.realpath(__file__)))

When Python sees the init files, it’ll now register the directory in the system path, which is where it looks to find modules/files/packages being imported.

So now in myapp, both of these imports will work

from client import ExampleClass
from utils.client_tools import AnotherClass

Solution: Add info to the folder’s __init__.py

Solution: Add info to the folder’s init.py