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@rhshadrach rhshadrach commented Sep 5, 2021

The method resample._GroupByMixin._gotitem calls

new_rs = type(self)(
    subset, groupby=groupby, parent=self, selection=selection, **kwargs
)

The selection (which ends up in kwargs in __init__) was being ignored.

@rhshadrach rhshadrach added Bug Regression Functionality that used to work in a prior pandas version Resample resample method labels Sep 5, 2021
@rhshadrach rhshadrach added this to the 1.3.3 milestone Sep 5, 2021
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Thanks @rhshadrach

# GH 42905
ts = Timestamp("2021-02-28 00:00:00")
df = DataFrame({"class": ["beta"], "value": [69], "date": [ts]})
result = (
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nit. can you make the result assignment just the op under test.

.resample("M")["value"]
.agg(["sum", "size"])
)
index = pd.MultiIndex.from_tuples([("beta", ts)], names=["class", "date"])
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another nit. index -> expected_index or even okay to inline with the df creation as black generally tends to do a good job of making things readable

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Thanks @simonjayhawkins - comments addressed.

@jreback jreback merged commit c7d98e1 into pandas-dev:master Sep 6, 2021
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jreback commented Sep 6, 2021

thanks @rhshadrach

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jreback commented Sep 6, 2021

@meeseeksdev backport 1.3.x

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jreback commented Sep 6, 2021

@rhshadrach can you put up the manual backport :-<

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@meeseeksdev backport 1.3.x

meeseeksmachine pushed a commit to meeseeksmachine/pandas that referenced this pull request Sep 7, 2021
jreback pushed a commit that referenced this pull request Sep 7, 2021
@rhshadrach rhshadrach deleted the groupby_agg_regr branch September 7, 2021 21:50
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Bug Regression Functionality that used to work in a prior pandas version Resample resample method

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BUG: RecursionError using agg on a resampled SeriesGroupBy

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