codechu-color

Stdlib-only color palettes and format converters for Python 3.10+. Zero runtime dependencies.

Solves the cross-surface palette drift problem: CLI tools work in ANSI escapes, GTK apps work in hex / CSS, JSON exports want flat dicts. codechu-color keeps one source of truth and derives the rest.

Install

pip install codechu-color

Quick start

from codechu_color import Color, Palette, RISK, palette_for, to_gtk_css

# Single color in every form
green = Color.from_hex("#1a7f37", name="low")
green.rgb       # (26, 127, 55)
green.ansi_fg   # "\x1b[32m"
green.ansi_bg   # "\x1b[42m"

# Built-in semantic palette (GitHub accessibility-tuned)
RISK.low.hex    # "#1a7f37"
RISK.high.hex   # "#cf222e"

# Color-blind safe variants (Bang & Wong 2011)
pal = palette_for("risk", profile="deuteranopia")
pal.high.hex    # "#d55e00" (vermilion, safe for red-green confusion)

# Export for GTK CSS
css = to_gtk_css(RISK, prefix="risk-")
# .risk-low { color: #1a7f37; } ...

# Flat dict for JSON
RISK.to_dict()  # {"low": "#1a7f37", "medium": "#9a6700", "high": "#cf222e"}

WCAG helpers

from codechu_color import contrast_ratio, pick_text_color

contrast_ratio((255, 255, 255), (0, 0, 0))   # 21.0  (max)
pick_text_color((9, 105, 218))                # (255, 255, 255) — white on blue

Built-in palettes

Vision profiles

palette_for("risk", profile=...) accepts:

• "default" — GitHub semantic green / amber / red
• "protanopia" — safe for protan red-blindness
• "deuteranopia" — safe for deutan red-green confusion (most common)
• "tritanopia" — safe for tritan blue-yellow confusion

Profiles use the Bang & Wong (2011) qualitative palette (Nature Methods 8: 441).

License

MIT