Fixed #6732 -- Added missing word "must" in `templates_python.txt` docs, thanks Atul Varma.

Once you've created that Python module, you'll just have to write a bit of

Python code, depending on whether you're writing filters or tags.

To be a valid tag library, the module contain a module-level variable named

``register`` that is a ``template.Library`` instance, in which all the tags and

filters are registered. So, near the top of your module, put the following::

To be a valid tag library, the module must contain a module-level variable

named ``register`` that is a ``template.Library`` instance, in which all the

tags and filters are registered. So, near the top of your module, put the

following::

    from django import template