capybara/virtualenv/lib/python2.7/site-packages/flask/blueprints.py
def url_value_preprocessor(self, f):
        """Registers a function as URL value preprocessor for this
        blueprint.  It's called before the view functions are called and
        can modify the url values provided.
        """
        self.record_once(lambda s: s.app.url_value_preprocessors
            .setdefault(self.name, []).append(f))
        return f
def url_value_preprocessor(self, f):
        self.record_once(lambda s: s.app.url_value_preprocessors
            .setdefault(self.name, []).append(f))
        return f
def url_value_preprocessor ( self , f ) : self . record_once ( lambda s : s . app . url_value_preprocessors . setdefault ( self . name , [ ] ) . append ( f ) ) return f
Registers a function as URL value preprocessor for this
        blueprint.  It's called before the view functions are called and
        can modify the url values provided.
Registers a function as URL value preprocessor for this blueprint . It s called before the view functions are called and can modify the url values provided .