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add IRV smith-set resolution method

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This commit is contained in:
Thomas (Tom) C. Gorordo 2026-06-05 14:39:31 -07:00
parent fc0569e252
commit e0d0134fdd
Signed by: tgorordo
GPG key ID: 0CBED22BB0D94490
4 changed files with 153 additions and 19 deletions
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18
src/smithycmd.py
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@ -15,11 +15,16 @@ from rich.table import Table
from rich.panel import Panel
import polars as pl
from smithy import smith_set
from smithy import smith_set, irv_set
@click.command()
@click.argument("ballots", type=click.Path(exists=True, dir_okay=False))
@click.option(
"--try-resolve-irv",
is_flag=True,
help="Try to reduce or resolve the Smith set by running all-paths IRV on the set.",
)
@click.option(
"--show-ballots",
"-b",
@ -27,7 +32,7 @@ from smithy import smith_set
help="Show relevant ballots (after selections).",
)
@click.option("--pretty", "-p", is_flag=True, help="Pretty-print output.")
def cli(ballots: str, show_ballots=False, pretty=False) -> None:
def cli(ballots: str, try_resolve_irv=False, show_ballots=False, pretty=False) -> None:
"""
Compute the Smith set from a box of ranked-choice ballots -- .csv or .xls(x).
@ -56,7 +61,7 @@ def cli(ballots: str, show_ballots=False, pretty=False) -> None:
df = df.with_columns(
[
pl.col(c)
.cast(pl.Utf8)
.cast(pl.String)
.str.strip_chars()
.cast(pl.Int64, strict=False)
.fill_null(0)
@ -66,6 +71,9 @@ def cli(ballots: str, show_ballots=False, pretty=False) -> None:
# Compute Smith set
smiths = smith_set(df)
if len(smiths) > 1 and try_resolve_irv:
irv_ballots = df.select(smiths)
smiths = irv_set(irv_ballots)
if show_ballots and pretty:
preview = Table(title="Ballot Box")
@ -88,7 +96,9 @@ def cli(ballots: str, show_ballots=False, pretty=False) -> None:
console.print(
Panel.fit(
"\n".join(f"• {c}" for c in smiths),
title="Resulting Smith Set",
title="Resulting IRV-resolved Smith Set"
if (try_resolve_irv)
else "Resulting Smith Set",
border_style="green",
)
)