您可以对所有列进行分组，并获得具有大小的聚合。

import pandas as pd

df = pd.DataFrame(
    {
        "Account": ["ABC Inc"] * 3 + ["Company A"] * 3,
        "Booking": ["New", "Upsell"] * 3,
        "Churn": [1, 0, 1, 0, 1, 1],
    }
)

df.groupby(df.columns.to_list(), as_index=False).size()

# or, as pointed out by Chrysophylaxs
df.value_counts()

给予

Account Booking  Churn  size
0    ABC Inc     New      1     2
1    ABC Inc  Upsell      0     1
2  Company A     New      1     1
3  Company A  Upsell      0     1
4  Company A  Upsell      1     1