Why this utility exists

Python imports are resolved through sys.path, and that list is usually built from the current environment and installed packages. In small local projects, that can make sibling imports awkward when tests or scripts live in nested folders.

import_parent exists to make this behavior explicit and local to one helper call instead of spreading ad-hoc path manipulation across many files.

Why not rely on editable installs alone?

Editable installs are excellent for normal package development, but they are not always convenient for quick experiments, test utilities, or scripts that are not meant to be packaged. This utility gives you a lightweight option for those cases.

Design goals

• Small and explicit: one small function with a clear purpose.

• Idempotent: repeated calls do not duplicate entries in sys.path.

• Easy to read: the code and docs explain why the path is being adjusted.

Caveat

This helper changes process-level import behavior, so it is best used for local development and tests rather than as the main mechanism for a published library.