从一系列字典中获取第一个值

使用 lambda 函数与 get 对于匹配值,如果字典带有键 id 否则返回默认值,此处 0 :

orders_df = pd.DataFrame({'customer':[{'id': 454543543533, 'email': 'fdgr@gmail.com'}, 
                                      {'id': 437890767654, 'email': 'ereffewf@mail.com'},
                                      {'email': 'ereffewf@mail.com'}]})
print (orders_df)
                                            customer
0    {'id': 454543543533, 'email': 'fdgr@gmail.com'}
1  {'id': 437890767654, 'email': 'ereffewf@mail.c...
2                     {'email': 'ereffewf@mail.com'}

orders_df['customer'] = orders_df['customer'].apply(lambda x: x.get('id', 0))

或:

orders_df['customer'] = [x.get('id', 0) for x in orders_df['customer']]

print (orders_df)
       customer
0  454543543533
1  437890767654
2             0