python – 如何比较字典中的值？

{'METTS MARK': {'salary': 365788,'to_messages': 807,'deferral_payments': 'NaN','total_payments': 1061827,'exercised_stock_options': 'NaN','bonus': 600000,'restricted_stock': 585062,'shared_receipt_with_poi': 702,'restricted_stock_deferred': 'NaN','total_stock_value': 585062,'expenses': 94299,'loan_advances': 'NaN','from_messages': 29,'other': 1740,'from_this_person_to_poi': 1,'poi': False,'director_fees': 'NaN','deferred_income': 'NaN','long_term_incentive': 'NaN','email_address': 'mark.metts@enron.com','from_poi_to_this_person': 38},'BAXTER JOHN C': {'salary': 267102,'to_messages': 'NaN','deferral_payments': 1295738,'total_payments': 5634343,'exercised_stock_options': 6680544,'bonus': 1200000,'restricted_stock': 3942714,'shared_receipt_with_poi': 'NaN','total_stock_value': 10623258,'expenses': 11200,'from_messages': 'NaN','other': 2660303,'from_this_person_to_poi': 'NaN','deferred_income': -1386055,'long_term_incentive': 1586055,'email_address': 'NaN','from_poi_to_this_person': 'NaN'},'ELLIOTT STEVEN': {'salary': 170941,'total_payments': 211725,'exercised_stock_options': 4890344,'bonus': 350000,'restricted_stock': 1788391,'total_stock_value': 6678735,'expenses': 78552,'other': 12961,'deferred_income': -400729,'email_address': 'steven.elliott@enron.com','from_poi_to_this_person': 'NaN'}
}

这只是字典的一小部分.我将如何使用for循环遍历每个子词典的工资值,并将其与下一个词典进行比较,以找出谁拥有最高薪水？我正在尝试这样的事情：

big = 0
for i in data_dict:
    if data_dict[i]["salary"] > big:
        big = i
print i

但它并没有给我正确答案.另外,我如何使用for循环来检查谁拥有最高薪水和最大奖金？任何帮助将不胜感激.谢谢.