Import python project modules from tests subdirectory

Question

├── ledger
│   ├── __init__.py
│   ├── ledger_data.py
│   └── ledger_model.py
├── main.py
├── sscommon
│   ├── __init__.py
│   └── logging.py
└── tests
    └── test_ledger_data.py

I need to import classes from ledger_data module when running test_ledger_data.py . I currently do sys.path.append("../") in test_ledger_data.py or I have to add symbolik links to all modules being used to tests directory. Both options seem incorrect. How to do it correctly?

If I just run the file either from project root or tests directories I get error:

    from ledger.ledger_data import LedgerData
ImportError: No module named 'ledger'

Answer 1

You can create an __init__.py file in your folder, and import the parent dir using:

parent_dir = os.path.abspath(os.path.join(os.path.abspath(__file__), os.pardir))
sys.append(parent_dir)

This uses os.path to find out the directory based on your file location.

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Update : create the above __init__.py and reside it inside tests/ folder. Then, in your test_ledge_data.py put at the head of the file from __init__ import * ; this will import everything in your init file to your module namespace.