polars-list-math
polars-list-math is a Python/Rust package with list, JSON, and URL expression
helpers for Polars.
Import the package once to register extra methods on Expr.list and Expr.str:
import polars as pl
import polars_list_math # noqa: F401
Install
pip install polars-list-math
# or
uv add polars-list-math
Requires Python 3.12+ and polars>=1.39.3.
Methods
| Method | Result | Docs |
|---|---|---|
Expr.list.zip(...) |
Zip lists into list[struct] |
Polars proposal |
Expr.list.combinations(...) |
Pair items in one list, optionally skipping self-pairs | Combinations |
Expr.list.combinations_to(...) |
Pair each item with each item from another list | Combinations |
Expr.list.similarity(...) |
Weighted similarity between two lists | Similarity |
Expr.list.mean_similarity(...) |
Mean similarity inside a nested-list row | Similarity |
Expr.list.mean_similarity_to(...) |
Mean similarity to reference nested lists | Similarity |
Expr.str.json_object_items(...) |
Convert a JSON object to list[struct[key, value]] |
JSON object items |
Expr.str.json_array_values(...) |
Convert a JSON array to list[str] |
JSON array values |
Top-level expression helpers:
| Function | Result | Docs |
|---|---|---|
url_query_encode(expr, doseq=False) |
Encode a Struct or key/value list as a URL query string | URL query encoding |
url_build(...) |
Assemble a URL from optional component expressions | URL building |
The package also exports json_object_items(expr) and
json_array_values(expr) as top-level equivalents of the Expr.str methods.
The Python helper py_list_similarity(...) computes weighted similarity for
plain Python sequences.
If a future Polars release ships native methods with the same names, this package leaves the native implementation untouched.
Quick Examples
df = pl.DataFrame(
{
"a": [[1, 2, 3]],
"b": [[2, 1, 3]],
"groups": [[[1, 2, 3], [1, 2, 3], [4, 5, 6]]],
}
)
df.with_columns(
pl.col("a").list.similarity("b").alias("similarity"),
pl.col("groups").list.mean_similarity().alias("mean_similarity"),
pl.col("a").list.combinations().alias("pairs"),
pl.col("a").list.zip("b", fields=["a", "b"]).alias("zipped"),
)
Convert JSON strings to nested Polars values. String values stay strings, JSON
null stays null, and other values become compact JSON strings. Invalid JSON
returns null by default; pass strict=True to raise instead.
json_df = pl.DataFrame(
{
"object": ['{"name":"Ada","active":true,"note":null}'],
"array": ['["python",42,true,null]'],
}
)
json_df.select(
pl.col("object").str.json_object_items().alias("items"),
pl.col("array").str.json_array_values().alias("values"),
)
Encode query parameters and build URLs from expressions:
from polars_list_math import url_build, url_query_encode
pages = pl.DataFrame(
{
"host": ["example.com"],
"path": ["/search"],
"term": ["rust polars"],
"page": [2],
}
)
query = url_query_encode(pl.struct(q=pl.col("term"), page=pl.col("page")))
pages.select(
url_build(
scheme=pl.lit("https"),
netloc="host",
path="path",
query=query,
).alias("url")
)
More complete, runnable examples are available in the
examples
directory.
Development
make install
make develop
make test
Build and check the package locally:
make check-dist
Release steps are in docs/publishing.md.
1 maintainer
Metadata
1 maintainer
Release files for polars-list-math 0.1.2
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| polars_list_math-0.1.2.tar.gz | 37.8 kB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| polars_list_math-0.1.2-cp313-cp313-win_amd64.whl | CPython 3.13 | CPython 3.13 | Windows x86-64 | Details |
| polars_list_math-0.1.2-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.13 | CPython 3.13 | Linux glibc 2.17+ x86-64 | Details |
| polars_list_math-0.1.2-cp313-cp313-macosx_11_0_arm64.whl | CPython 3.13 | CPython 3.13 | macOS 11.0+ ARM64 | Details |
| polars_list_math-0.1.2-cp313-cp313-macosx_10_12_x86_64.whl | CPython 3.13 | CPython 3.13 | macOS 10.12+ x86-64 | Details |
| polars_list_math-0.1.2-cp312-cp312-win_amd64.whl | CPython 3.12 | CPython 3.12 | Windows x86-64 | Details |
| polars_list_math-0.1.2-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.12 | CPython 3.12 | Linux glibc 2.17+ x86-64 | Details |
| polars_list_math-0.1.2-cp312-cp312-macosx_11_0_arm64.whl | CPython 3.12 | CPython 3.12 | macOS 11.0+ ARM64 | Details |
| polars_list_math-0.1.2-cp312-cp312-macosx_10_12_x86_64.whl | CPython 3.12 | CPython 3.12 | macOS 10.12+ x86-64 | Details |
Total release size: 38.8 MB
Release files / polars_list_math-0.1.2.tar.gz
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