How Do I Perform Relative Imports in Python and Avoid the 'Attempted relative import in non-package' Error?

How can I do relative imports in Python?

When trying to import modules from different subpackages within a directory structure, you may encounter the "Attempted relative import in non-package" error. This issue stems from running the module as the main module, which treats relative imports as if the module were at the top level.

To resolve this issue, ensure that the module is not being executed as the main module. In Python 2.6 and later, you can use the package attribute to determine the module's position in the package hierarchy and resolve relative imports accordingly. Refer to PEP 366 for more information on this change.

The package attribute provides a cleaner solution than sys.path manipulation hacks. It allows you to import modules relative to the main module, similar to the behavior described in PEP 366.

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