str.starts_with¶

ColExpr.str.starts_with( prefix: str, ) → ColExpr[Bool][source]¶

Whether the string starts with a given prefix.

Parameters:: prefix – The prefix to check.

Examples

>>> t = pdt.Table(
...     {
...         "a": ["  BCD ", "-- 00", " A^^u", "-O2", ""],
...         "b": ["12431", "transform", "12__*m", "   ", "abbabbabba"],
...     },
...     name="string table",
... )
>>> (
...     t
...     >> mutate(
...         j=t.a.str.starts_with("-"),
...         k=t.b.str.starts_with("12"),
...     )
...     >> show()
... )
Table string table, backend: PolarsImpl
shape: (5, 4)
┌────────┬────────────┬───────┬───────┐
│ a      ┆ b          ┆ j     ┆ k     │
│ ---    ┆ ---        ┆ ---   ┆ ---   │
│ str    ┆ str        ┆ bool  ┆ bool  │
╞════════╪════════════╪═══════╪═══════╡
│   BCD  ┆ 12431      ┆ false ┆ true  │
│ -- 00  ┆ transform  ┆ true  ┆ false │
│  A^^u  ┆ 12__*m     ┆ false ┆ true  │
│ -O2    ┆            ┆ true  ┆ false │
│        ┆ abbabbabba ┆ false ┆ false │
└────────┴────────────┴───────┴───────┘