In Python, I know you print the values of a key in a dictionary by doing variable.values()
. But what if I wanted to print a value of a particular value?
For an example:
pets = {'Dog': ['Poodle', 'Boxer', 'Terrier'], 'Cat': ['Sphynx', 'Ragdoll', 'Birman']}
I want to specifically choose a particular breed of animal. For instance, I just want to print Boxer
.
You could do something like:
animal = list(pets.values())[0]
breed = list(animal.values())[1]
print(breed)
This will give you Boxer
. However, I was curious if I can do this in a single line of code like printing a value of a value.
I've tried:
breed = list(list(pets.values()))[0][1]
but it tells me that the string index is out of range.
print(list(pets.values()))
output:
[['Poodle', 'Boxer', 'Terrier'], ['Sphynx', 'Ragdoll', 'Birman']]
breed = list(pets.values())[0][1]
your data structure is a dict with "sets" as values. sets are not subscriptable and converting in a list doesn't keep the order
>>> list(pets['Dog'])
['Boxer', 'Poodle', 'Terrier']
the question is then.... what do you really need?
If you need to access to breed you could/should use lists or tuples instead of sets
it seems strange about how you are using dict, I assume in your case you should use list instead
pets = {'Animal': {'Dog': ['Poodle', 'Boxer', 'Terrier'], 'Cat': ['Sphynx', 'Ragdoll', 'Birman']}}
if you want a specific breed to print, then you might need an additional key for that to gain benefits of using dict
pets = {'Animal': {'Dog': {1:'Poodle', 2:'Boxer', 3:'Terrier'}, 'Cat': ['Sphynx', 'Ragdoll', 'Birman']}}
then you can get boxer with
pets['Animal']['Dog'][2]
The way you are defining this dictionary creates a syntax error:
>>> pets = {'Animal': 'Dog':{'Poodle','Boxer','Terrier'}, 'Cat':{'Sphynx','Ragdoll','Birman'}}
File "<stdin>", line 1
pets = {'Animal': 'Dog':{'Poodle','Boxer','Terrier'}, 'Cat':{'Sphynx','Ragdoll','Birman'}}
^
SyntaxError: invalid syntax
I created a similar dictionary (this time a dictionary of species as key and breeds as values), and show how you can index this new dictionary:
>>> pets = {'Dog':('Poodle','Boxer','Terrier'), 'Cat':('Sphynx','Ragdoll','Birman')}
>>> pets['Dog'][1]
'Boxer'
>>>
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.