编辑:下面是一个更复杂的示例的简化代码。
def lottery(amount, callback=None):
print(f'You spent {amount} on a lottery ticket.')
if callback:
callback(amount)
def win(amount):
print(f'You won ${amount * 1000}!!!')
def lose(amount):
print(f"Sorry, you spent {amount} and didn
型号:
class Person(models.Model):
name = ....
class Registration(models.Model):
person = models.ForeignKey(person)
expires = models.DateField()
每年都有一个新的登记记录。
现在我想找出所有登记过期或从未登记的人。有点像
Person.objects.filter(registration__expires__lte=date.today() )
当然,在针对person的查询中不能使用“注册”。
是否需要将最新的注册日期存储在pers
我有一个包含用户响应的JSON ():
var surveyJSON = {pages:[{name:"page1",elements:[{type:"rating",name:"How confident are you conducting market analysis?",description:"5 - most confident"},{type:"rating",name:"How confident are you evaluating the feasibility of a new op