下面是 处理 DataFrame 列名 的常用方式总结，涵盖单层级列名与**多层级列名（MultiIndex）**的统一和拼接策略：
🔹 1. 保留原始列名（适用于单层或已清洗好的列名）
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# 保持不变
df.columns = df.columns
🔹 2. 只保留多层级列名中的第一个层级（例如：只保留 'A'）
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df.columns = df.columns.map(lambda x: x[0] if isinstance(x, tuple) else x)
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