ImportWarning
ImportWarning: can't resolve package from __spec__ or __package__
Traceback
Traceback (most recent call last):
File "main.py", line 2, in <module>
from . import helper # relative import fails
ImportWarning: can't resolve package from __spec__ or __package__What causes this error
The import system detected an ambiguous or unusual condition during module loading. The module loaded but the import resolution encountered edge cases.
How to fix it
Add `__init__.py` files to make directories proper packages. Use `python -m module` instead of `python module.py` for package scripts. Ensure `__package__` and `__spec__` are set correctly.
Code that causes this error
# Running: python mypackage/script.py (instead of -m) from . import helper # relative import fails
Fixed code
# Run properly as a module: # python -m mypackage.script from . import helper # works with -m
About ImportWarning
An ImportWarning is issued during the import process when something suspicious is detected that does not prevent the import from completing. This is a relatively rare warning that most developers never encounter. It appears in edge cases involving package detection, namespace packages, and the import system's fallback mechanisms.
Common triggers include importing from directories that are ambiguously packages (no `__init__.py` and not recognized as namespace packages), running scripts as modules incorrectly, and issues with `__spec__` or `__package__` attributes during import resolution. By default, ImportWarning is ignored. It is primarily useful for package maintainers and framework developers who need to debug import system behavior.
The fix usually involves proper package structure with `__init__.py` files and correct use of `python -m package.module`.
Common scenarios
Using deprecated APIs that will be removed in future versions
Performing numerical operations that produce inf or NaN values
Leaving files, sockets, or connections open without proper cleanup
Calling async functions without awaiting the result