what is the use of pivot table in python code example

Example 1: pd.pivot_table

>>> table = pd.pivot_table(df, values=['D', 'E'], index=['A', 'C'],
...                     aggfunc={'D': np.mean,
...                              'E': [min, max, np.mean]})
>>> table
                D    E
            mean  max      mean  min
A   C
bar large  5.500000  9.0  7.500000  6.0
    small  5.500000  9.0  8.500000  8.0
foo large  2.000000  5.0  4.500000  4.0
    small  2.333333  6.0  4.333333  2.0

Example 2: pivot table

SELECT *        -- Total invoices per gender
FROM (
    SELECT invoice, gender
    FROM sales
) d
PIVOT (
    sum(invoice)
    FOR gender IN ('F' AS "Women", 'M' AS "Men")
);
-- Table Sales:
CREATE TABLE sales (
    gender VARCHAR2(1 BYTE),		-- 'F' or 'M'
    invoice NUMBER
);