python - 验证字典中 boolean 变量的状态

Question

我正在使用一些标志来跟踪以下操作:

is_registered = True
has_paid = False    
has_phone  = True

if (is_registered and has_phone and has_paid):
    do_something

但是如果字段数量增加我更愿意将其存储在字典中

user_flags = {'is_registered':True,'has_paid':False,'has_phone':True}

if (user_flags['is_registered'] and user_flags['has_paid'] and user_flags['has_phone']):
    do_something

同样，对于少量项目来说这可能没问题，但如果我说超过 50 个项目，它会变得非常冗长

Answer 1

您可以使用 all() :

>>> user_flags = {'is_registered':True, 'has_paid':False, 'has_phone':True}
>>> all(user_flags.values())
False

>>> user_flags = {'is_registered':True, 'has_paid':True, 'has_phone':True, 'one_more_flag':True}
>>> all(user_flags.values())
True

---

或者，用 any() 来反转逻辑:

>>> user_flags = {'is_registered':True, 'has_paid':False, 'has_phone':True}
>>> not any(not value for value in user_flags.values())
False

>>> user_flags = {'is_registered':True, 'has_paid':True, 'has_phone':True, 'one_more_flag':True}
>>> not any(not value for value in user_flags.values())
True