Given this nested dictionary, how could I print all the "phone" values using a for loop?
people = {
'Alice': {
'phone': '2341',
'addr': '87 Eastlake Court'
},
'Beth': {
'phone': '9102',
'addr': '563 Hartford Drive'
},
'Randy': {
'phone': '4563',
'addr': '93 SW 43rd'
}
for d in people.values():
print d['phone']
Using a list comprehension
>>> [people[i]['phone'] for i in people]
['9102', '2341', '4563']
Or if you'd like to use a for
loop.
l = []
for person in people:
l.append(people[person]['phone'])
>>> l
['9102', '2341', '4563']
Loop over the values and then use get()
method, if you want to handle the missing keys, or a simple indexing to access the nested values. Also, for the sake of optimization you can do the whole process in a list comprehension :
>>> [val.get('phone') for val in people.values()]
['4563', '9102', '2341']
Readable code is more valuable than optimized code. If the time for the operation to complete doesn't matter.
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