parameters: (self)
return_statement: return list(self)
docstring: D.keys() -> list of D's keys
docstring_summary: D.keys() -> list of D's keys
docstring_tokens: D . keys () - > list of D s keys
function: def keys(self):
          "D.keys() -> list of D's keys"
          return list(self)
function_tokens: def keys ( self ) : return list ( self )