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categorical-comparison-analysis

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对两类分类数据进行对比分析，统计数量差异与比例关系并生成可视化图表。

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

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# categorical-comparison-analysis

> This sub-skill covers one capability of the Excel workflow. For reading/counting/Parquet optimization, see the parent workflow SKILL.md.

Step1 读取文件并统计所有 sheet 的总行数，评估是否需要进行大文件优化处理。
```python
import pandas as pd
from pandas import read_excel
from pathlib import Path

# 统计所有 sheet 的行数以决定处理策略
file_path = "input_data.xlsx"
sheet_names = pd.ExcelFile(file_path).sheet_names
total_rows = 0
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