DateTimeProperty在Google App Engine中将错误设置为日期时间

Question

我在写一些Google App Engine代码时出现奇怪的错误。

我的程序包含这样一些代码：

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，这产生以下错误：

 
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 

上为什么发生这种情况的任何想法？我已经测试过它，并且我知道我的时间正在进入，正在转换正确，但是却遇到了这个错误。

Answer 1

我觉得你在追踪中错过了一些东西。

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

注意逗号在该行的末尾。

该逗号使该行返回其中包含日期的元组。我假设你不小心添加了逗号，所以只需将其删除，并且您应该正确指定日期时间。

审查：

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