当名为“Keyword”的列中的值与相邻值重复时，我试图覆盖名为“Group”的列中的值。
例如，因为字符串“commercial office cleaning services”是重复的，所以我想将相邻的列覆盖为“commercial cleaning services”。

示例数据

所需输出

最小可重现示例

import pandas as pd

data = [
    ["commercial cleaning services", "commercial cleaning services"],
    ["commercial office cleaning services", "commercial cleaning services"],
    ["janitorial cleaning services", "commercial cleaning services"],
    ["commercial office services", "commercial cleaning"],
]
df = pd.DataFrame(data, columns=["Keyword", "Group"])
print(df)

我对Pandas还很陌生，不知道从哪里开始，我已经到了一个死胡同，谷歌和搜索堆栈溢出。