如果不存在并基于2列条件，则在df pandas中添加行

import pandas as pd

# 创建一个示例的DataFrame
data = {'A': [1, 2, 3],
        'B': ['a', 'b', 'c']}
df = pd.DataFrame(data)

# 设置条件
condition1 = df['A'] > 2
condition2 = df['B'] == 'c'

# 筛选出满足条件的行
filtered_rows = df[condition1 & condition2]

# 创建新的行
new_row = {'A': 4, 'B': 'd'}

# 将新行添加到DataFrame中
df = df.append(new_row, ignore_index=True)

# 输出结果
print(df)

   A  B
0  1  a
1  2  b
2  3  c
3  4  d