import polars.selectors as cs
import polars as pl

# set up an empty dataframe with plenty of columns of various dtypes
df = pl.DataFrame(
    schema={
        "abc": pl.UInt16,
        "bbb": pl.UInt32,
        "cde": pl.Float64,
        "def": pl.Float32,
        "eee": pl.Boolean,
        "fgg": pl.Boolean,
        "ghi": pl.Time,
        "JJK": pl.Date,
        "Lmn": pl.Duration,
        "opp": pl.Datetime("ms"),
        "qqR": pl.String,
    },
)



# Select the SYMMETRIC DIFFERENCE of numeric columns and columns that contain an "e"
assert df.select(cs.contains("e") ^ cs.numeric()).schema == {
    "abc": UInt16,
    "bbb": UInt32,
    "eee": Boolean,
}