If、Elif、大于、小于逻辑

Question

如果一个用户达到一定金额，我对这个游戏有多个条件，那么如果其他用户达到他们的水平，他们偷的钱越多。

我在试图弄清楚逻辑时遇到了问题。我添加了 cmets 提问，但我只是不知道是否有更简单的方法来处理这类事情。

当我开始我的 if 语句时，我是从较小的值开始还是应该从较大的值开始？

# do I need to put a check and money(message.author) < 500000 here?
if money(message.author) >= 20000 and money(user) < 20000: 
    do_thing1()
# do I need to put a check and money(user) < 500000 here?
elif money(message.author) < 20000 and money(user) >= 20000: 
    do_thing1()
# do I need to put a check money(message.author) and money(user) < 500000 here?
elif money(message.author) >= 20000 and money(user) >= 20000: 
    do_thing2()
# do I need to put a check and money(user) >= 20000 here?
elif money(message.author) >= 500000 and money(user) < 500000: 
    do_thing2()
# do I need to put a check and money(message.author) >= 20000 here?
elif money(message.author) < 500000 and money(user) >= 500000: 
    do_thing2()
elif money(message.author) >= 500000 and money (user) >= 500000: 
    do_thing3()

Answer 1

请注意，如果 both 小于 20000，或者 both 大于 20000 但小于 500000，您不会显示会发生什么。我将展示那些下面处理。

if money(message.author) < 20000 and money(user) < 20000:
    do_thing0()  # both have < 20000. You didn't show this case.
elif money(message.author) < 20000 or money(user) < 20000:
    do_thing1()  # only one of them has < 20000
elif money(message.author) < 500000 and money(user) < 500000:
    do_thingX()  # both have >= 20000 but < 500000. You didn't show this case.
elif money(message.author) < 500000 or money(user) < 500000:
    do_thing2()  # both have >= 20000, only one of them has < 5000000
else:
    do_thing3()  # both have >= 500000

如果您不关心两者都有< 20000 或两者都有>= 20000 and < 500000 的情况，那么您可以使用异或来缩短它：

elif money(message.author) < 20000 ^ money(user) < 20000:
    do_thing1()  # only one of them has < 20000
elif money(message.author) < 500000 ^ money(user) < 500000:
    do_thing2()  # both have >= 20000, only one of them has < 5000000
elif money(message.author) >= 500000 and money(user) >= 50000
    do_thing3()  # both have >= 500000

请注意，在最后一种情况下，我们需要明确，否则我们将捕获前两种情况未捕获的任何内容，在这里我假设您不想例如，抓住两者都小于 20000 的情况。

您的代码按顺序执行，因此如果您通过其中一项检查，就会告诉您有关您所在范围的信息，您可以相应地调整您的逻辑。

例如，一旦你完成了elif money(message.author) < 500000 and ... 的检查，你就会知道money(message.author) >= 20000 和 money(user) >= 20000，因为如果不是这样，你就不会走到这一步不是真的。

Answer 2

# Do I need to put a check and money(message.author) < 500000 here?

是的，您这样做了，否则您的某些案例将包括其他案例，例如，如果 money(message.author) == 500001 和 money(user) == 1，您可能希望 dothing2 发生，但它会触发 dothing1。

您可以对那些使用比较链接，例如而不是

if money(message.author) >= 20000 and money(message.author) < 500000 and money(user) < 20000: 
    dothing1

你可以使用更短的

if 20000 <= money(message.author) < 500000 and money(user) < 20000: 
    dothing1

另外，定义两个临时变量ma = money(message.author) 和mu = money(user) 可能会极大地提高可读性。考虑到大量的if 和elif 语句，您甚至可以定义ma1 = ma < 20000、ma2 = 20000 <= ma < 500000 等，但这可能是矫枉过正。您还可以定义变量 low = 20000 和 high = 500000，防止拼写错误（是四个零还是五个？），并使其更容易在将来更改。

if low <= ma < high and mu < low: 
    do_thing1()
elif ma < low and low <= mu < high: 
    do_thing1()
elif low <= ma and low <= mu: 
    do_thing2()
elif high <= ma and mu < high: 
    do_thing2()
elif ma < high and high <= mu: 
    do_thing2()
elif high <= ma and high <= mu: 
    do_thing3()