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# `sphinx.ext.viewcode` – Add links to highlighted source code

Module author: Georg Brandl

New in version 1.0.

This extension looks at your Python object descriptions (`.. class::`, `.. function::` etc.) and tries to find the source files where the objects are contained. When found, a separate HTML page will be output for each module with a highlighted version of the source code, and a link will be added to all object descriptions that leads to the source code of the described object. A link back from the source to the description will also be inserted.

There is an additional config value:

`viewcode_import`

  If this is `True`, viewcode extension will follow alias objects that imported from another module such as functions, classes and attributes. As side effects, this option else they produce nothing. The default is `True`.

  Warning

  `viewcode_import` imports the modules to be followed real location. If any modules have side effects on import, these will be executed by `viewcode` when `sphinx-build` is run.

  If you document scripts (as opposed to library modules), make sure their main routine is protected by a `if __name__ == '__main__'` condition.

  New in version 1.3.