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jxramos/pandas_notes.md

Created June 2, 2025 19:09
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pandas notes
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pandas_notes.md

Apply group size count to each record

df['colX_count']= df.colX.map(df.colX.value_counts())

source https://stackoverflow.com/a/55576813/1330381 great for pairing log records that appear in groups of a known size you wish to filter on by the group size

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