polars.Expr.str.n_chars#

Expr.str.n_chars() → Expr[source]#

Get length of the strings as UInt32 (as number of chars).

Notes

If you know that you are working with ASCII text, lengths will be equivalent, and faster (returns length in terms of the number of bytes).

Examples

>>> df = pl.DataFrame({"s": ["Café", None, "345", "東京"]}).with_columns(
...     [
...         pl.col("s").str.n_chars().alias("nchars"),
...         pl.col("s").str.lengths().alias("length"),
...     ]
... )
>>> df
shape: (4, 3)
┌──────┬────────┬────────┐
│ s    ┆ nchars ┆ length │
│ ---  ┆ ---    ┆ ---    │
│ str  ┆ u32    ┆ u32    │
╞══════╪════════╪════════╡
│ Café ┆ 4      ┆ 5      │
│ null ┆ null   ┆ null   │
│ 345  ┆ 3      ┆ 3      │
│ 東京  ┆ 2      ┆ 6      │
└──────┴────────┴────────┘