---
name: candlestick
description: Candlestick pattern recognition engine, pure pandas vectorized implementation of 15 classic candlestick patterns (5 single-candle + 5 double-candle + 4 triple-candle + 1 trend confirmation), generating a composite signal from bullish/bearish pattern scores.
category: strategy
---
# Candlestick Pattern Recognition
## Purpose
Identifies 15 classic candlestick patterns and generates trading signals:
### Single-Candle Patterns (5)
| Pattern | Signal | Description |
|------|------|------|
| Hammer | Bullish | Long lower shadow with a small body at the top |
| Inverted Hammer | Bullish | Long upper shadow with a small body at the bottom |
| Shooting Star | Bearish | Long upper shadow with a small body at the bottom (appears after an uptrend) |
| Doji | Neutral | Open and close are nearly equal |
| Spinning Top | Neutral | Small body with roughly equal upper and lower shadows |
### Double-Candle Patterns (5)
| Pattern | Signal |
|------|------|
| Bullish Engulfing | Bullish |
| Bearish Engulfing | Bearish |
| Bullish Harami | Bullish |
| Bearish Harami | Bearish |
| Piercing Line | Bullish |
| Dark Cloud Cover | Bearish |
### Triple-Candle Patterns (4)
| Pattern | Signal |
|------|------|
| Morning Star | Bullish |
| Evening Star | Bearish |
| Three White Soldiers | Bullish |
| Three Black Crows | Bearish |
## Signal Logic
Bullish patterns score +1, bearish patterns score -1. Go long when the total score is > 0, go short when it is < 0, and stand aside when it equals 0.
## Parameters
| Parameter | Default | Description |
|------|--------|------|
| body_pct | 0.1 | Threshold for body-to-range ratio in a doji |
| shadow_ratio | 2.0 | Ratio of shadow length to body length |
## Dependencies
```bash
pip install pandas numpy requests
```
## Signal Convention
- `1` = long, `-1` = short, `0` = stand aside