Django optional url parameters

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I have a Django URL like this:

url(
    r'^project_config/(?P<product>\w+)/(?P<project_id>\w+)/$',
    'tool.views.ProjectConfig',
    name="project_config"
),

views.py:

def ProjectConfig(request, product, project_id=None, template_name="project.html"):
    ...
    # do stuff

The problem is that I want the project_id parameter to be optional.

I want /project_config/ and /project_config/12345abdce/ to be equally valid URL patterns, so that if project_id is passed, then I can use it.

As it stands at the moment, I get a 404 when I access the URL without the project_id parameter.

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