数据帧内的 Pandas 计算

Question

Have a simple pandas dataframe like that:

      period        count
       0            4000
       1            20000

How can I perform calcualtion 4000/(4000+20000) using pandas syntax and this dataframe?

Answer 1

You can use the rolling method to sum and then divide.

df['count'].rolling(2).apply(lambda x: x[0] / x.sum()).dropna()

1    0.166667