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