How to Import a File from a Subdirectory in Python?

Importing a File from a Subdirectory

Problem:

You have a Python file named tester.py located in the /project directory, and another file named BoxTime.py in a subdirectory called lib within the /project directory. Despite attempting to import BoxTime using the import command, you encounter an ImportError.

Solution:

To resolve this issue, follow the steps outlined in the Python Packaging Documentation (Section 6.4):

1. Create an __init__.py File:
   Place a blank file named __init__.py in the lib subdirectory. This file indicates that the directory is a Python package, enabling Python to recognize it as a module.

2. Adjust Import Statement:
   In tester.py, adjust the import statement to specify the full path to the BoxTime module:

   import lib.BoxTime

3. Optional Alternative:
   Alternatively, you can use the following import statement to alias the BoxTime module as BT:

   import lib.BoxTime as BT

   This allows you to access BoxTime functions as BT.bt_function() instead of lib.BoxTime.bt_function().

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