parameters: (filtername)
return_statement: return None
docstring: Lookup a filter by name. Return None if not found.
docstring_summary: Lookup a filter by name. Return None if not found.
docstring_tokens: Lookup a filter by name . Return None if not found .
function: def find_filter_class(filtername):
      """
      Lookup a filter by name. Return None if not found.
      """
      if filtername in FILTERS:
          return FILTERS[filtername]
      for name, cls in find_plugin_filters():
          if name == filtername:
              return cls
      return None
function_tokens: def find_filter_class ( filtername ) : if filtername in FILTERS : return FILTERS [ filtername ] for name , cls in find_plugin_filters ( ) : if name == filtername : return cls return None