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Pandas DataFrame | first method

Pandas
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Documentation
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DataFrame
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Data Selection and Renaming
schedule Jul 1, 2022
Last updated
local_offer PythonPandas
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tocTable of Contents
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Pandas DataFrame.first(~) method returns all rows that fall in the first n days (or whatever time unit you specify), where n is the specified offset.

Parameters

1. offset | string or DateOffset or dateutil.relativedelta

The datetime offset.

Return value

A DataFrame.

Examples

Consider the following DataFrame:

index_datetime = pd.date_range("2020-12-25", periods=5, freq="D") # Days
df = pd.DataFrame({"A":["a","b","c","d","e"]}, index=index_datetime)
df
A
2020-12-25 a
2020-12-26 b
2020-12-27 c
2020-12-28 d
2020-12-29 e

To fetch the first 3 days:

df.first("3D")
A
2020-12-25 a
2020-12-26 b
2020-12-27 c
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Published by Isshin Inada
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