CODEWITHSUNDEEP
python
RedRum
RedRum

Reputation: 982

Why does this keep returning the last value of the dictionary?

So i'm practicing my nested dictionary skills with this data:

content = {'results': 
    [
        {'_class': 'question',
    'course': {'_class': 'course',
        'title': 'Angular 7 (formerly Angular 2) - The Complete Guide',
        'url': '/the-complete-guide-to-angular-2/'},
    'replies': [{'_class': 'answer',
        'user': {'_class': 'user',
         'display_name': 'Maximilian'}}]},
        
        {'_class': 'question',
    'course': {'_class': 'course',
        'title': 'RUSTCRACEON',
        'url': '/the-holy-rust-book/'},
    'replies': [{'_class': 'answer',
        'user': {'_class': 'user',
         'display_name': 'Ella'}}]},
                    
        {'_class': 'question',
    'course': {'_class': 'course',
        'title': 'PHP ULTIMATE WEB GUIDE',
        'url': '/php-to-the-world/'},
    'replies': [{'_class': 'answer',
        'user': {'_class': 'user',
         'display_name': 'Rick_Sanchez'}}]},
        
        {'_class': 'question',
    'course': {'_class': 'course',
        'title': 'Javascript - The Complete Guide',
        'url': '/javascript291/'},
    'replies': [{'_class': 'answer',
        'user': {'_class': 'user',
         'display_name': 'Morty'}}]}
]}

I'm able to access the value in the results key using this and all is good:

question_access = content['results']

If I want to loop through the dictionaries inside the results key I use this:

for question_data in question_access:
    print(question_data)

Which gives me this.. all is good:

{'_class': 'question', 'course': {'_class': 'course', 'title': 'Angular 7 (formerly Angular 2) - The Complete Guide', 'url': '/the-complete-guide-to-angular-2/'}, 'replies': [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Maximilian'}}]}
{'_class': 'question', 'course': {'_class': 'course', 'title': 'RUSTCRACEON', 'url': '/the-holy-rust-book/'}, 'replies': [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Ella'}}]}
{'_class': 'question', 'course': {'_class': 'course', 'title': 'PHP ULTIMATE WEB GUIDE', 'url': '/php-to-the-world/'}, 'replies': [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Rick_Sanchez'}}]}
{'_class': 'question', 'course': {'_class': 'course', 'title': 'Javascript - The Complete Guide', 'url': '/javascript291/'}, 'replies': [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Morty'}}]}

Problem

But now my problem is.. if I want to access the replies key in the question_data key, I keep getting the last replies value and not all of the values.

i.e:

replies_access = question_data['replies']

returns:

[{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Morty'}}]

Shouldn't replies_access = question_data['replies'] return all of the values that have the replies key and not only the last value? Or am i doing something wrong?

Upvotes: 0

Views: 147

Answers (2)

Mathamagic
Mathamagic

Reputation: 107

replies_access = question_data['replies'] will assign the value of the current question_data to replies_access. Since you're in a for loop, you keep assigning the next replies value to replies_access. Therefore in the last iteration you assign the last replies object and that's what you get when you print. Instead, you can make a list comprehension or use append.

replies_access = list()
for question_data in question_access:
    replies_access.append(question_data['replies'])

or

replies_access = [ question_data['replies'] for question_data in question_access]

Upvotes: 1

azro
azro

Reputation: 54148

One question_data is one element only from the values, so accessing ['replies'] gives you one for sure, and if you keep saving it in the same variable, at the end, only the last one remain

You may use a list to collect the replies during the loop

replies = []
for question_data in question_access:
    replies_access = question_data['replies']
    replies.append(replies_access)

print(replies)

[[{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Maximilian'}}], 
 [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Ella'}}], 
 [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Rick_Sanchez'}}], 
 [{'_class': 'answer', 'user': {'_class': 'user', 'display_name': 'Morty'}}]]

Upvotes: 2

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