Lower_case 字典键和值

Question

我有一个函数应该 return true 用于区分大小写的键和值 US_STATES

from localflavor.us.us_states import US_STATES

def check_state(value):
    return value in dict(US_STATES).values())
print(US_STATES)

结果是：

(('AK', 'Alaska'), ('AL', 'Alabama'), ('AR', 'Arkansas'), ('AZ', 'Arizona'), ('CA', 'California'), ('CO', 'Colorado'), ('CT', 'Connecticut'), ('DC', 'District of Columbia'), ('DE', 'Delaware'), ('FL', 'Florida'), ('GA', 'Georgia'), ('HI', 'Hawaii'), ('IA', 'Iowa'), ('ID', 'Idaho'), ('IL', 'Illinois'), ('IN', 'Indiana'), ('KS', 'Kansas'), ('KY', 'Kentucky'), ('LA', 'Louisiana'), ('MA', 'Massachusetts'), ('MD', 'Maryland'), ('ME', 'Maine'), ('MI', 'Michigan'), ('MN', 'Minnesota'), ('MO', 'Missouri'), ('MS', 'Mississippi'), ('MT', 'Montana'), ('NC', 'North Carolina'), ('ND', 'North Dakota'), ('NE', 'Nebraska'), ('NH', 'New Hampshire'), ('NJ', 'New Jersey'), ('NM', 'New Mexico'), ('NV', 'Nevada'), ('NY', 'New York'), ('OH', 'Ohio'), ('OK', 'Oklahoma'), ('OR', 'Oregon'), ('PA', 'Pennsylvania'), ('RI', 'Rhode Island'), ('SC', 'South Carolina'), ('SD', 'South Dakota'), ('TN', 'Tennessee'), ('TX', 'Texas'), ('UT', 'Utah'), ('VA', 'Virginia'), ('VT', 'Vermont'), ('WA', 'Washington'), ('WI', 'Wisconsin'), ('WV', 'West Virginia'), ('WY', 'Wyoming'))

此函数 returns true 仅用于值，但我还需要 return true 用于键这是状态代码，对于不区分大小写的键值对，函数应该 return true。

Answer 1

我没有使用 Django（你显然是）所以让我们从基础开始：

STATES = (('AK', 'Alaska'), ('AL', 'Alabama'), ('AR', 'Arkansas'), ('AZ', 'Arizona'), ('CA', 'California'), ('CO', 'Colorado'), ('CT', 'Connecticut'), ('DC', 'District of Columbia'), ('DE', 'Delaware'), ('FL', 'Florida'), ('GA', 'Georgia'), ('HI', 'Hawaii'), ('IA', 'Iowa'), ('ID', 'Idaho'), ('IL', 'Illinois'), ('IN', 'Indiana'), ('KS', 'Kansas'), ('KY', 'Kentucky'), ('LA', 'Louisiana'), ('MA', 'Massachusetts'), ('MD', 'Maryland'), ('ME', 'Maine'), ('MI', 'Michigan'), ('MN', 'Minnesota'), ('MO', 'Missouri'), ('MS', 'Mississippi'),
          ('MT', 'Montana'), ('NC', 'North Carolina'), ('ND', 'North Dakota'), ('NE', 'Nebraska'), ('NH', 'New Hampshire'), ('NJ', 'New Jersey'), ('NM', 'New Mexico'), ('NV', 'Nevada'), ('NY', 'New York'), ('OH', 'Ohio'), ('OK', 'Oklahoma'), ('OR', 'Oregon'), ('PA', 'Pennsylvania'), ('RI', 'Rhode Island'), ('SC', 'South Carolina'), ('SD', 'South Dakota'), ('TN', 'Tennessee'), ('TX', 'Texas'), ('UT', 'Utah'), ('VA', 'Virginia'), ('VT', 'Vermont'), ('WA', 'Washington'), ('WI', 'Wisconsin'), ('WV', 'West Virginia'), ('WY', 'Wyoming'))

statesByCode = {k.lower(): v.lower() for k, v in STATES} # keyed on lowercase state code
statesByState = {v.lower(): k.lower() for k, v in STATES} # keyed on lowercase state name

只需创建两个字典，其中键的 'normal form' 是小写的。一本字典键入州代码，另一本字典键入州名。

那么你可以这样做：

def check_state(value):
  return value.lower() in statesByCode

因此您可以轻松（并且非常快速）检查给定的州代码是否有效。

例如，

check_state('Co')

...会 return 是吗

州相似（全名）：

def check_state_name(value):
  return value.lower() in statesByState

例如，

check_state_name('ALabamA')

...会 return 是吗

Lower_case 字典键和值

Lower_case the dictionary keys and values

python

django-validation

python-3.x