pandas的列表理解:如果pandas中的列包含字符串，则返回带有字符串的新列

import pandas as pd

# 创建一个包含字符串的数据框
data = {'col1': ['apple', 'banana', 'orange', 'grape'],
        'col2': ['I like apple', 'I hate banana', 'I love orange', 'I dislike grape']}
df = pd.DataFrame(data)

# 使用列表理解创建新列
df['new_col'] = [x if 'apple' in x else '' for x in df['col2']]

# 打印结果
print(df)

     col1            col2        new_col
0   apple   I like apple          I like apple
1  banana  I hate banana
2  orange  I love orange
3   grape  I dislike grape