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

Question

我正在撰写的一些Google App Engine代码出现了一个奇怪的错误.

我的程序包含一些这样的代码:

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,这会产生以下错误:

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

有关为什么会发生这种情况的任何想法？我已经测试了它,我知道我的时间进入,正在正确转换,但随后出现了这个错误.

Answer 1

我认为你的追溯中有一些错过的东西.

我正在看:datetime.datetime.strptime(self.request.get("visibleDate"), "%Y/%m/%d"),

注意该行末尾的逗号.

该逗号使该行返回一个元组,其中包含您的日期.我假设你不小心添加了逗号,所以只需删除它就应该正确分配日期时间.

回顾:

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