diff --git a/narwhals/expression.py b/narwhals/expression.py index 214813315..a633092e2 100644 --- a/narwhals/expression.py +++ b/narwhals/expression.py @@ -347,6 +347,38 @@ def sum(self) -> Expr: return self.__class__(lambda plx: self._call(plx).sum()) def min(self) -> Expr: + """ + Returns the minimum value(s) from a column(s). + + Examples: + >>> import pandas as pd + >>> import polars as pl + >>> import narwhals as nw + >>> df_pd = pd.DataFrame({'a': [1, 2], 'b': [4, 3]}) + >>> df_pl = pl.DataFrame({'a': [1, 2], 'b': [4, 3]}) + + Let's define a dataframe-agnostic function: + >>> def func(df_any): + ... df = nw.from_native(df_any) + ... df = df.select(nw.min('a','b')) + ... return nw.to_native(df) + + We can then pass either pandas or Polars to `func`: + + >>> func(df_pd) + a b + 0 1 3 + >>> func(df_pl) + shape: (1, 2) + ┌─────┬─────┐ + │ a ┆ b │ + │ --- ┆ --- │ + │ i64 ┆ i64 │ + ╞═════╪═════╡ + │ 1 ┆ 3 │ + └─────┴─────┘ + """ + return self.__class__(lambda plx: self._call(plx).min()) def max(self) -> Expr: