高效地从pandas字典列中提取数据

import pandas as pd

# 创建包含字典列的DataFrame
data = {'col1': [{'key1': 'value1', 'key2': 'value2'}, {'key1': 'value3', 'key2': 'value4'}]}
df = pd.DataFrame(data)

# 定义提取数据的函数
def extract_data(row):
    return row['key1']

# 使用apply函数提取数据
df['col1_extracted'] = df['col1'].apply(lambda x: extract_data(x))

# 打印结果
print(df['col1_extracted'])