DateTimeProperty在Google App Engine中將錯誤設置爲日期時間

Question

我在寫一些Google App Engine代碼時出現奇怪的錯誤。

我的程序包含這樣一些代碼：

import datetime 

... 

class Action(db.Model): 
    visibleDate = db.DateTimeProperty() 

... 

getActionQuery = Action.gql("WHERE user = :user AND __key__ = :key", user = user, key = self.request.get("key")) 
theAction = getActionQuery.get() 

.... 

theAction.visibleDate = datetime.datetime.strptime(self.request.get("visibleDate"), "%Y/%m/%d") 

然而，這產生以下錯誤：

 
Traceback (most recent call last): 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/webapp/__init__.py", line 509, in __call__ 
    handler.post(*groups) 
    File "/Users/redbird/Developer/betterdo-it/main.py", line 132, in post 
    theAction.visibleDate = datetime.datetime.strptime(self.request.get("visibleDate"), "%Y/%m/%d"), 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 472, in __set__ 
    value = self.validate(value) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.py", line 2308, in validate 
    (self.name, self.data_type.__name__)) 
BadValueError: Property visibleDate must be a datetime 

上爲什麼發生這種情況的任何想法？我已經測試過它，並且我知道我的時間正在進入，正在轉換正確，但是卻遇到了這個錯誤。

Answer 1

我覺得你在追蹤中錯過了一些東西。

我看到：datetime.datetime.strptime(self.request.get("visibleDate"), "%Y/%m/%d"),

注意逗號在該行的末尾。

該逗號使該行返回其中包含日期的元組。我假設你不小心添加了逗號，所以只需將其刪除，並且您應該正確指定日期時間。

審查：

from datetime import datetime 
a = (datetime(2000,1,1),) 
assert isinstance(a, tuple) 
a = (datetime(2000,1,1)) 
assert isinstance(a, datetime)