如果一列str.contain Pandas中的特定字符，则合并两列

import pandas as pd

# 创建一个示例DataFrame
data = {'col1': ['apple', 'banana', 'orange', 'grape'],
        'col2': ['app', 'nan', 'ge', 'pear']}
df = pd.DataFrame(data)

# 使用str.contains()方法创建布尔型Series
contains_condition = df['col1'].str.contains('a')

# 使用布尔型Series选择满足条件的行，并将两列合并为新的列
df['merged_col'] = df.loc[contains_condition, 'col1'] + df.loc[contains_condition, 'col2']

# 打印结果
print(df)

     col1  col2 merged_col
0   apple   app  appleapp
1  banana   nan        NaN
2  orange    ge  orangege
3   grape  pear        NaN