Hi I want to define a polars schema. It works fine without a datetime format. However it fails with pl.Datetime. import polars as pl testing_schema: pl.Schema = pl.Schema( { "date": pl.Datetime, "some_int": pl.Int64, "some_str": pl.Utf8, "some_cost": pl.Float64, }, )  The error: lib/python3.11/site-packages/polars/schema.py", line 47, in _check_dtype raise TypeError(msg) TypeError: dtypes must be fully-specified, got: Datetime  Unfortunately I do not have any idea on how to fix it.
If you look at pl.Datetime, you'll find that it is initialized with parameters: class polars.datatypes.Datetime( time_unit: TimeUnit = 'us', time_zone: str | timezone | None = None )  Unlike, say, pl.Int64. Hence, you need to add the parentheses at the end, (), to use the defaults, or to pass arguments and override them. import polars as pl testing_schema: pl.Schema = pl.Schema( { "date": pl.Datetime(), "date2": pl.Datetime(time_unit="ns", time_zone="UTC"), "some_int": pl.Int64, }, ) 