根据pandas dataframe中同一行的前一列值计算增加或减少的百分比

import pandas as pd

data = {'日期': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-04'],
        '销售额': [100, 150, 120, 200]}
df = pd.DataFrame(data)

import pandas as pd

data = {'日期': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-04'],
        '销售额': [100, 150, 120, 200]}
df = pd.DataFrame(data)

df['前一天销售额'] = df['销售额'].shift(1)
df['增减百分比'] = (df['销售额'] - df['前一天销售额']) / df['前一天销售额'] * 100

print(df)

          日期  销售额  前一天销售额      增减百分比
0  2022-01-01  100      NaN         NaN
1  2022-01-02  150    100.0   50.000000
2  2022-01-03  120    150.0  -20.000000
3  2022-01-04  200    120.0   66.666667