pandas -从索引中提取月份和年份 [英] Pandas - extracting month and year from index

问题描述

我有一个以日期时间为索引的数据框.如何从索引中提取年份和月份?下面是我的数据框.

I have a dataframe with datetime as index. How can I extract year and month from the index? Below is my dataframe.

            1. open   2. high    3. low  4. close   5. volume
date                                                         
2019-01-07   101.64  103.2681  100.9800    102.06  35656136.0
2019-01-08   103.04  103.9700  101.7134    102.80  31294058.0

显然 df ["index"].dt.month 或 df ["date"].dt.month 无效.

推荐答案

您可以举以下示例，但是您可以从

You can take below example, However you can have the details usage from Docs pandas.DatetimeIndex

示例DataFrame:

Example DataFrame:

>>> df
                              name  age favorite_color  grade  birth_date
Willard Morris      Willard Morris   20           blue     88  01-02-1996
Al Jennings            Al Jennings   19            red     92  08-05-1997
Omar Mullins          Omar Mullins   22         yellow     95  04-28-1996
Spencer McDaniel  Spencer McDaniel   21          green     70  12-16-1995

1)要提取年份:

>>> df['year'] = pd.DatetimeIndex(df['birth_date']).year
>>> df.head()
                              name  age favorite_color  grade  birth_date  year
Willard Morris      Willard Morris   20           blue     88  01-02-1996  1996
Al Jennings            Al Jennings   19            red     92  08-05-1997  1997
Omar Mullins          Omar Mullins   22         yellow     95  04-28-1996  1996
Spencer McDaniel  Spencer McDaniel   21          green     70  12-16-1995  1995

2)要提取月份:

>>> df['month'] = pd.DatetimeIndex(df['birth_date']).month
>>> df.head()
                              name  age favorite_color  grade  birth_date  year  month
Willard Morris      Willard Morris   20           blue     88  01-02-1996  1996      1
Al Jennings            Al Jennings   19            red     92  08-05-1997  1997      8
Omar Mullins          Omar Mullins   22         yellow     95  04-28-1996  1996      4
Spencer McDaniel  Spencer McDaniel   21          green     70  12-16-1995  1995     12

3)要提取year_with_month:

>>> df['month_year'] = pd.to_datetime(df['birth_date']).dt.to_period('M')
>>> df
                              name  age favorite_color  grade  birth_date  year  month month_year
Willard Morris      Willard Morris   20           blue     88  01-02-1996  1996      1    1996-01
Al Jennings            Al Jennings   19            red     92  08-05-1997  1997      8    1997-08
Omar Mullins          Omar Mullins   22         yellow     95  04-28-1996  1996      4    1996-04
Spencer McDaniel  Spencer McDaniel   21          green     70  12-16-1995  1995     12    1995-12

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