在python的字典中遍历字典

Question

So let's say i have

dictionary = {
    'Moe': {
             'name':'moe',
             'age':24,
             'married':False
           },
    'Jon': {
             'name':'jon',
             'age':22,
             'married':False
           },
    'andrew': 
           {'name':'andrew',
            'age':27,
            'married':True
           }
}

Suppose that i want to iterate through the dictionary to find out how many person is married in this dictionary, how can i do it?

Answer 1

You could use the following generator comprehension to lookup married in the inner dictionaries setting the default value to 0 , and take the sum :

sum(i.get('married', 0) for i in dictionary.values())
#1

Answer 2

You need:

count = 0
for v in dictionary.values():
  if v['married']:
    count += 1

print(count)

Answer 3

One way of doing it is like this:

n_married = 0 
for key, item in d.items(): 
    name, age, married = item 
    n_married += 1 if married else 0 
print(n_married)

Answer 4

result = 0 for x in dictionary: if dictionary[x]['married'] == True: result += 1 print(result)