How can I do relative imports in Python?

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The problem is that you’re running the module as ‘__main__’ by passing the mod1.py as an argument to the interpreter.

From PEP 328:

Relative imports use a module’s __name__ attribute to determine that module’s position in the package hierarchy. If the module’s name does not contain any package information (e.g. it is set to ‘__main__’) then relative imports are resolved as if the module were a top level module, regardless of where the module is actually located on the file system.

In Python 2.6, they’re adding the ability to reference modules relative to the main module. PEP 366 describes the change.

According to Nick Coghlan, the recommended alternative is to run the module inside the package using the -m switch.

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