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Supercharged DataFrame indexing

Project description

Documentation status Latest PyPI version Python versions supported Code style: black

pandas-select is a collection of DataFrame selectors that facilitates indexing and selecting data, fully compatible with pandas vanilla indexing.

The selector functions can choose variables based on their name, data type, arbitrary conditions, or any combination of these.

pandas-select is inspired by two R libraries: tidyselect and recipe.


pandas-select is a Python-only package hosted on PyPI. The recommended installation method is pip-installing into a virtualenv:

$ pip install pandas-select

Design goals

# pandas-select
df[StartsWith("Type") | "Legendary"]

# vanilla
cols = df.select_dtypes(exclude="number").columns
cond = lambda col : col.startswith("Type") or col == "Legendary"
cols = [col for col in df.columns if cond(col)]
# pandas-select
name = Contains("Jeff", axis="index", level="Name")

# vanilla
selector = df_mi.index.get_level_values("Name").str.contains("Jeff")
  • Allow deferred selection when the DataFrame’s columns are not known in advance, for example in automated machine learning applications. pandas_select offers integration with sklearn.
from pandas_select import AnyOf, AllBool, AllNominal, AllNumeric, ColumnSelector
from sklearn.compose import make_column_transformer
from sklearn.preprocessing import OneHotEncoder, StandardScaler

ct = make_column_transformer(
    (StandardScaler(), ColumnSelector(AllNumeric() & ~AnyOf("Generation"))),
    (OneHotEncoder(), ColumnSelector(AllNominal() | AllBool() | "Generation"))

Project details

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