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TypeError: unsupported operand type(s) for -: 'DatetimeArray' and 'relativedelta'

I'd like to do a manual train-test-split for a random forest or linear regression on a dataframe called whatever_df based on the Date column. I would use this column to select all rows that have dates earlier than 3 months before the most recent one in the column to make a new dataframe called train_df with those older dates, and a test_df with all the dates within the latest 3 months. In raw format the dataframe looks like:

        PC1         PC2         Date
0      -0.319258    -0.042817   2019-05-24
1      -0.246079    0.131233    2019-05-24
2      -0.037325    0.562841    2019-05-24
3      -0.080725    0.594007    2019-05-24
4       0.133341    0.322822    2019-05-24
             ...    ...   ...   ...
3607    -3.583419   3.766158    2022-06-26
3608    -3.305263   4.019327    2022-06-26
3609    -2.913036   4.854316    2022-06-26
3610    -2.755733   4.873996    2022-06-26
3611    -2.535929   4.582312    2022-06-26

So what I'd want for train_df would be all the rows where Date is up through March 2022 inclusive and test_df would be all the rows for March 2022-June 2022. I know I could just hardcode this but I would like a dynamic way to select rows based on month values, and I know with datetime formatted columns I could find the newest date with just max(df['Date']) but I'm not sure how to say in Python subtract 3 months from that

I have tried this:

from datetime import datetime
from dateutil.relativedelta import relativedelta
train_df = whatever_df[whatever_df['Date'] - relativedelta(months=3)]

But I get

TypeError: unsupported operand type(s) for -: 'DatetimeArray' and 'relativedelta'

Part of the problem is that each month's day in the Date column is somewhat arbitrary, so there really is no row with 2022-03-26 in the Date column, unless by sheer coincidence. Therefore, I need a way to select for just the month of the date in the Date column, and not exactly 3 months earlier to the day.



source https://stackoverflow.com/questions/73534022/typeerror-unsupported-operand-types-for-datetimearray-and-relativedelta

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