(GH28250) • Implemented pandas.core.window.Window.var() and pandas.core.window.Window. std() functions (GH26597) • Added encoding argument to DataFrame.to_string() for non-ascii text (GH28766) • Added testing module has been deprecated. Use the public API in pandas.testing documented at Testing functions (GH16232). • pandas.SparseArray has been deprecated. Use pandas.arrays.SparseArray (arrays. SparseArray) when grouping by a categorical column (GH28787) • Remove error raised due to duplicated input functions in named aggregation in DataFrame.groupby() and Series.groupby(). Previously error will be raised

known as “named aggregation”, for naming the output columns when applying multiple aggregation functions to specific columns (GH18366, GH26512). In [1]: animals = pd.DataFrame({'kind': ['cat', 'dog', groupby objects as well. Because there’s no need for column selection, the values can just be the functions to apply In [5]: animals.groupby("kind").height.agg( ...: min_height="min", ...: max_height="max" for more. 1.1.2 Groupby Aggregation with multiple lambdas You can now provide multiple lambda functions to a list-like aggregation in pandas.core.groupby.GroupBy. agg (GH26430). In [6]: animals.groupby('kind')

known as “named aggregation”, for naming the output columns when applying multiple aggregation functions to specific columns (GH18366, GH26512). In [1]: animals = pd.DataFrame({'kind': ['cat', 'dog', groupby objects as well. Because there’s no need for column selection, the values can just be the functions to apply In [5]: animals.groupby("kind").height.agg( ...: min_height="min", ...: max_height="max" for more. 1.1.2 Groupby Aggregation with multiple lambdas You can now provide multiple lambda functions to a list-like aggregation in pandas.core.groupby.GroupBy. agg (GH26430). In [6]: animals.groupby('kind')

. . . . . . . . . 658 2.15.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 658 2.15.2 Window functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 952 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 954 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251 3.3.5 Binary operator functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1252 3.3.6 Function application

. . . . . . . . . 658 2.15.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 658 2.15.2 Window functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 951 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 954 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251 3.3.5 Binary operator functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1252 3.3.6 Function application

. . . . . . . . . 648 2.12.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 648 2.12.2 Window Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 933 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 935 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1212 3.3.5 Binary operator functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1213 3.3.6 Function application

. . . . . . . . . 649 3.12.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 649 3.12.2 Window Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 935 4.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 937 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1214 4.3.5 Binary operator functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1215 4.3.6 Function application

. . . . . . . . . 652 2.12.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 652 2.12.2 Window Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 937 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 939 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1216 3.3.5 Binary operator functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1217 3.3.6 Function application

and Linking to External CSS . . . . . . . . . . . . . . . . . . . . . . . . . 750 2.16.6 Styler Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 751 2.16.7 Tooltips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 766 2.17.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 766 2.18 Group by: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1090 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1094 3

and Linking to External CSS . . . . . . . . . . . . . . . . . . . . . . . . . 751 2.16.6 Styler Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 752 2.16.7 Tooltips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767 2.17.1 Statistical functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767 2.18 Group by: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1090 3.2 General functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1094 3