dataframe按列求百分比

要按列求百分比，可以使用Pandas库中的`div`方法和`sum`方法来实现。其中，`div`方法用于将每个元素除以该列的和，`sum`方法用于计算每列的总和。具体代码如下所示：

import pandas as pd

# 创建一个示例DataFrame
df = pd.DataFrame({'A':[1, 2, 3], 'B':[4, 5, 6], 'C':[7, 8, 9})

# 按列求百分比
result = df.div(df.sum())

# 输出结果
print(result)

这样，就可以得到按列求百分比后的DataFrame。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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