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[Robert Collins <robert.collins@xxxxxxxxxxxxx>]

Just noticed while discussing stuff with Maris that feature flags are
being used in a very odd way.

This is the right way to use a flag in a template:

<div tal:condition="features/FLAG_NAME">...</div>

For instance
<div tal:condition="features/soyuz.derived-series-ui.enabled">...</div>

This will execute when the flag is defined to a non-None, non-empty
string value.

To use a flag in python code:

if features.getFeatureFlag('soyuz.derived-series-ui.enabled'):
    ...

Will do precisely the same thing.

Finally, if you need to get a value back, you can interpret the flag. E.g.

value = features.getFeatureFlag('soyuz.derived-series-ui.enabled')
if value:
    print value

-Rob