Possible bug in EndpointEnumerator

[SXHRYU]

https://github.com/encode/django-rest-framework/blob/master/rest_framework/schemas/generators.py#L127

Can someone explain how does this line of code work?

if path.endswith('.{format}') or path.endswith('.{format}/'):
    return False  # Ignore .json style URLs.

Like, doesn't it check for literal ".{format}" or ".{format}/" ending of a string? I can pass ".json" strings and this check won't pass

If I'm wrong, please explain if there is some code happening behind the scenes