使用另一列中的唯一值在Pandas dataframe中创建列表的新列

import pandas as pd

data = {'A': [1, 2, 3, 4, 5],
        'B': ['a', 'b', 'c', 'a', 'b']}
df = pd.DataFrame(data)

unique_values = df['B'].unique()

for value in unique_values:
    df[value] = df['B'] == value

import pandas as pd

data = {'A': [1, 2, 3, 4, 5],
        'B': ['a', 'b', 'c', 'a', 'b']}
df = pd.DataFrame(data)

unique_values = df['B'].unique()
for value in unique_values:
    df[value] = df['B'] == value

print(df)

   A  B      a      b      c
0  1  a   True  False  False
1  2  b  False   True  False
2  3  c  False  False   True
3  4  a   True  False  False
4  5  b  False   True  False