pandas date_range在月初生成月度数据 [英] Pandas date_range to generate monthly data at beginning of the month

问题描述

我正在尝试生成月度数据的日期范围，其中日期总是在月初:

I'm trying to generate a date range of monthly data where the day is always at the beginning of the month:

pd.date_range(start='1/1/1980', end='11/1/1991', freq='M')

这将生成1/31/1980，2/29/1980等.相反，我只想要1/1/1980，2/1/1980，...

This generates 1/31/1980, 2/29/1980, and so on. Instead, I just want 1/1/1980, 2/1/1980,...

我已经看到另一个有关生成始终在一个月的特定日期的数据的问题，回答说不可能，但是肯定可以在月初开始！

I've seen other question ask about generating data that is always on a specific day of the month, with answers saying it wasn't possible, but beginning of month surely must be possible!

推荐答案

您可以通过将freq参数从'M'更改为'MS'来实现:

You can do this by changing the freq argument from 'M' to 'MS':

d = pandas.date_range(start='1/1/1980', end='11/1/1990', freq='MS')    
print(d)

现在应该打印:

DatetimeIndex(['1980-01-01', '1980-02-01', '1980-03-01', '1980-04-01',
               '1980-05-01', '1980-06-01', '1980-07-01', '1980-08-01',
               '1980-09-01', '1980-10-01', 
               ...
               '1990-02-01', '1990-03-01', '1990-04-01', '1990-05-01',
               '1990-06-01', '1990-07-01', '1990-08-01', '1990-09-01',
               '1990-10-01', '1990-11-01'],
              dtype='datetime64[ns]', length=131, freq='MS', tz=None)

查看 偏移别名 文档的一部分.在那里，'M'表示月末(月末频率)，而'MS'表示月末(月起始频率).

Look into the offset aliases part of the documentation. There it states that 'M' is for the end of the month (month end frequency) while 'MS' for the beginning (month start frequency).

这篇关于 pandas date_range在月初生成月度数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！