在Pandas DF中将最大值按行替换为1 (else =0

import pandas as pd

# 创建示例DataFrame
df = pd.DataFrame({'A': [1, 2, 3, 4],
                   'B': [5, 6, 7, 8],
                   'C': [9, 10, 11, 12]})

# 将最大值按行替换为1，其他值替换为0
df = df.apply(lambda x: pd.Series([1 if val == x.max() else 0 for val in x]), axis=1)

print(df)

   A  B  C
0  0  0  1
1  0  0  1
2  0  0  1
3  0  0  1