Python peewee更新關鍵字作爲變量

Question

是否有可能在Python中使用peewee + MySQL數據庫在update函數中使用某些變量作爲關鍵字？

例如：

what = raw_input('What you want to change? name, surname, email ') 
value = raw_input('What is the value?') 

update = Users.update(what=value).where(Users.id == some_user_id) 
update.execute() 

如果我們有表是這樣的：

class Users(BaseModel): 
    email = CharField(max_length=50, null=True) 
    name = CharField(max_length=50, null=True) 
    surname = CharField(max_length=50, null=True) 

class Meta: 
    db_table = 'users' 

Answer 1

是的，你可以傳遞一個解壓dictionary作爲關鍵字參數，就像這樣：

update = Users.update(**{what: value}).where(Users.id == some_user_id) 

它是如何工作的示例：

>>>def foo(a=2): 
... print a 
... 
>>>foo(**{'a': 3}) 
3 
>>>b = 'a' 
>>>foo(**{b: 4}) 
4 
>>>foo(**{'c': 5}) 
TypeError: f() got an unexpected keyword argument 'c' 
>>>foo({'a': 6}) 
{'a': 6} 

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