Windows 10 上的 python 3.6 熊猫 1.1.2
尝试更改 MultiIndex 0 级的日期格式,同时将值保留为日期时间。例如:
dates = pd.date_range(start='2017-01-01', end='2020-12-01', freq='M')
n = [1, 2, 3, 4]
idx = pd.MultiIndex.from_product([dates, n], names=['date', 'n'])
idx[:5]
给予:
MultiIndex([('2017-01-31', 1),
('2017-01-31', 2),
('2017-01-31', 3),
('2017-01-31', 4),
('2017-02-28', 1)],
names=['date', 'n'])
哪里:type(idx.get_level_values(0))
是
class 'pandas.core.indexes.datetimes.DatetimeIndex'
现在,我想更改日期值以仅显示月份和年份,同时保留它们的类型。例如:
MultiIndex([('Jan-2017', 1),
('Jan-2017', 2),
('Jan-2017', 3),
('Jan-2017', 4),
('Feb-2017', 1)],
names=['date', 'n'])