Function format

Example

> df = pl.DataFrame({
...   "a": ["a", "b", "c"],
...   "b": [1, 2, 3],
... })
> df.select(
...   pl.format("foo_{}_bar_{}", pl.col("a"), "b").alias("fmt"),
... )
shape: (3, 1)
┌─────────────┐
│ fmt         │
│ ---         │
│ str         │
╞═════════════╡
│ foo_a_bar_1 │
├╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ foo_b_bar_2 │
├╌╌╌╌╌╌╌╌╌╌╌╌╌┤
│ foo_c_bar_3 │
└─────────────┘

// You can use format as tag function as well
> pl.format("foo_{}_bar_{}", pl.col("a"), "b") // is the same as
> pl.format`foo_${pl.col("a")}_bar_${"b"}`
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