polars.Series.str.to_lowercase

Series.str.to_lowercase() → Series

将字符串修改为它们的小写等效形式。

示例

>>> s = pl.Series("foo", ["CAT", "DOG"])
>>> s.str.to_lowercase()
shape: (2,)
Series: 'foo' [str]
[
    "cat"
    "dog"
]