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group-by-analysis

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对多 Sheet 的 Excel 文件进行行数统计、大文件 Parquet 转换预处理、数据清洗及分组聚合分析，并生成带样式标记的统计表与可视化图表。

skills/sn-da-excel-workflow/capability/excel-data-analysis/group-by-analysis/SKILL.md

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Nov 3, 2026
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Step1 对数据进行清洗与预处理，包括处理合并单元格、正则过滤以及分类映射。
```python
import re

# 1. 处理合并单元格：向前填充
target_col = 'category_column'
df[target_col] = df[target_col].ffill()

# 2. 正则清洗：去除无效字符或筛选特定格式
def clean_text(text):
    if pd.isna(text): return text
    return re.sub(r'[^\w\s]', '', str(text)).strip()

df[target_col] = df[target_col].apply(clean_text)
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