创建pandas列，条件是基于字典的另一个列值

import pandas as pd

# 创建示例数据框
data = {'dict_col': [{'key1': 'value1', 'key2': 'value2'}, {'key1': 'value3', 'key2': 'value4'}]}
df = pd.DataFrame(data)

# 使用apply函数和lambda表达式创建新列
df['new_col'] = df['dict_col'].apply(lambda x: x.get('key1') if isinstance(x, dict) and 'key1' in x else None)