如何在pandas中添加Block列，以便Trials[1,2,3]分组为1,2,3,4..and，等等？

import pandas as pd

# 创建一个示例数据框
data = {'Trials': [1, 2, 3, 1, 2, 3]}
df = pd.DataFrame(data)

# 添加Block列
df = df.assign(Block=(df['Trials'] != df['Trials'].shift()).cumsum())

# 打印结果
print(df)

   Trials  Block
0       1      1
1       2      2
2       3      3
3       1      4
4       2      5
5       3      6