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我有以下views.py代码。使用DateTimeFields捕获'NoneType'异常
now_time = datetime.datetime.now()
for r in requests:
hmt = r.date_of_notification - now_time
if hmt <= datetime.timedelta(days = 1):
r.time_action_status = 'staction_day'
else:
r.time_action_status = 'non_staction_day'
有时候,我得到一个错误,因为在请求某些date_of_notification是空的(NoneType):
TypeError: unsupported operand type(s) for -: 'NoneType' and 'datetime.timedelta'
models.py:
date_of_notification = models.DateTimeField(blank=True, null=True)
什么样的验证为r.date_of_notification
我应该使用,以避免错误?