I'm trying to use a combination of contains
method together when
in polars. However, I'm getting the following annoying error:
Exception has occurred: ColumnNotFoundError
Foo message.
I read the documentation, but the examples are quite simple and don't cover a situation like this. Here follows my code sample:
df = df.with_columns(
pl.when(pl.col("Foo").str.contains("Foo message. Bar Message."))
.then("Foo message")
.alias("Foo_Column")
)
Any help is appreciated.
You're probably looking for
df = df.with_columns(
pl.when(pl.col("Foo").str.contains("Foo message. Bar Message."))
.then(pl.lit("Foo message"))
.alias("Foo_Column")
)
otherwise Polars thinks "Foo message" is the name of a column