Pandas Dataframe:如果A、B或C列中的行包含“x”或"y"，则将“z”写入新列

import pandas as pd

# 创建一个示例Dataframe
data = {'A': ['x', 'y', 'z', 'w'],
        'B': ['a', 'b', 'c', 'd'],
        'C': ['x', 'y', 'z', 'w']}
df = pd.DataFrame(data)

# 使用条件语句和逻辑运算符创建新列
df['new_column'] = df['A'].isin(['x', 'y']) | df['B'].isin(['x', 'y']) | df['C'].isin(['x', 'y'])
df['new_column'] = df['new_column'].map({True: 'z', False: ''})

# 打印结果
print(df)

   A  B  C new_column
0  x  a  x          z
1  y  b  y          z
2  z  c  z           
3  w  d  w