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condition-filtering-and-large-file-optimization

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根据数据规模动态选择处理策略。

skills/sn-da-excel-workflow/capability/excel-data-filtering/condition-filtering/SKILL.md

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# condition_filtering

> **Note**: This sub-skill covers one step of the Excel analysis workflow. For the full pipeline (file reading, row counting, large-file optimization, export), see the parent workflow SKILL.md.

Step1 执行多维度数据清洗与条件筛选，包含列名自动识别、RGB 颜色过滤、前缀匹配及正则提取。
```python
# 1. 自动识别同义列名并筛选非空值
target_cols = ['域名', '缩写', 'code', 'domain']
for col in target_cols:
    if col in df.columns:
        df = df[df[col].notna()]
        break

# 2. 基于数值通道的精确筛选（如 RGB 颜色过滤）
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