如何计算Pandas DataFrame中行之间的百分比增长？

import pandas as pd

data = {'A': [10, 20, 30, 40, 50],
        'B': [15, 25, 35, 45, 55]}
df = pd.DataFrame(data)

df['Percentage Change'] = df['A'].pct_change()

print(df)

import pandas as pd

data = {'A': [10, 20, 30, 40, 50],
        'B': [15, 25, 35, 45, 55]}
df = pd.DataFrame(data)

df['Percentage Change'] = df['A'].pct_change()

print(df)

    A   B  Percentage Change
0  10  15                NaN
1  20  25           1.000000
2  30  35           0.500000
3  40  45           0.333333
4  50  55           0.250000