在dataframe中按行比较列

import pandas as pd

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

# 按行比较列
df['Comparison'] = df.apply(lambda row: row['A'] == row['B'] == row['C'], axis=1)

# 打印结果
print(df)

A  B  C  Comparison
0  1  4  7       False
1  2  5  8       False
2  3  6  9       False