如何在pandas中基于两列合并多行

import pandas as pd

data = {'col1': ['A', 'A', 'B', 'B', 'C'],
        'col2': [1, 2, 3, 4, 5],
        'col3': ['X', 'Y', 'Z', 'W', 'V']}
df = pd.DataFrame(data)

grouped = df.groupby(['col1', 'col2'])

result = grouped.agg({'col3': ', '.join})

print(result)

import pandas as pd

data = {'col1': ['A', 'A', 'B', 'B', 'C'],
        'col2': [1, 2, 3, 4, 5],
        'col3': ['X', 'Y', 'Z', 'W', 'V']}
df = pd.DataFrame(data)

grouped = df.groupby(['col1', 'col2'])
result = grouped.agg({'col3': ', '.join})

print(result)