| list_series(keyword=None, code=None, name=None) | 
| Lists Ipeadata available time series. | 
| keyword | str, optional | Filtering keyword, defaults to None | 
| code | str, optional | Specifies a time series code to return. code must be a time series code respecting case sensitiveness | 
| name | str, optional | Specifies a time series name to return. name must be a time series name respecting case sensitiveness | 
| return | pandas.DataFrame | If no keyword is specified, returns a data frame containing all Ipeadata?s time series. Otherwise, returns a data frame respecting the introduced parameters |