为什么这个函数不起作用：Python

我想做一个循环，直到今天的日期与之前的日期匹配为止。这是我的密码：

from datetime import date
Months = ["January","February","March","April","May","June","July","August","September","October","November","December"]
today = date.today()

A= ("%s %s" % (Months[today.month - 1],today.day))
end_date= "December 1"


while A != end_date:
    a=today.day
    a=a-1
    A= ("%s %s" % (Months[today.month - 1],a))
    print(A)

如果我在循环a中指定减小直到a等于结束日期，为什么我的循环会在12月9日卡住

a=today.day

需要在循环之外：

from datetime import date
Months = ["January","February","March","April","May","June","July","August","September","October","November","December"]
today = date.today()

A= ("%s %s" % (Months[today.month - 1],today.day))
end_date= "December 1"

a=today.day
while A != end_date:
    #a=today.day
    a=a-1
    A= ("%s %s" % (Months[today.month - 1],a))
    print(A)

---

每次循环运行时，您都将a设置为当前日期-1，这样它就不会减少。

因为您在每次迭代中都重新定义了a。将a=today.day移出循环的第一行是错误的。每次迭代，a变量都会在第一行中得到今天。