什么是PyCharm"简化链式比较"

Question

我有以下功能，PyCharm正在提醒我关于“简化链式比较”的elif语句。代码工作，我得到了我想要的对象，只是想知道警告以及如何使其更好？

     def preferred_contacts(self):
         x = random.randint(0, 100)
         email = u'E'
         text = u'M'
         phone = u'P'
         letter = u'L'
         none = u'N'

         if x < 25:
            return email
         elif x >= 26 and x <= 50:
            return text
         elif x >= 51 and x <= 75:
            return phone
         elif x >= 76 and x <= 100:
            return letter
         else:
            return none

Answer 1

简化了链式调用，代码更加简洁。见下文

def preferred_contacts(self):
x = random.randint(0, 100)
email = u'E'
text = u'M'
phone = u'P'
letter = u'L'
none = u'N'

if x < 25:
    return email
elif 26 <= x <= 50: # reads as "x is between 26 and 50, inclusive
    return text
elif 51 <= x <= 75: # reads as "x is between 51 and 75, inclusive
    return phone
elif 76 <= x <= 100: # reads as "x is between 76 and 100, inclusive
    return letter
else:
    return none

Answer 2

@mhlester应该因为注意到您可以删除

return ('E', 'M', 'P', 'L', 'N')[x / 25] # This assumes x has an upper bound of 124 or less.

当然，在这种情况下，你可以让你的生活变得更简单。

return random.choice(('E', 'M', 'P', 'L', 'N'))