(self, plugin)
return(plugin in self.instances)
Return a boolean value indicating whether a plugin is enabled or
        not
Return a boolean value indicating whether a plugin is enabled or
        not
Return a boolean value indicating whether a plugin is enabled or not
def is_enabled(self, plugin):
        """Return a boolean value indicating whether a plugin is enabled or
        not"""
        return(plugin in self.instances)
def is_enabled ( self , plugin ) : return ( plugin in self . instances )