CODEWITHSUNDEEP
pythondictionaryfor-looptuples
anonymous
anonymous

Reputation: 361

Python AttributeError: 'dict' object has no attribute 'append'

I am creating a loop in order to append continuously values from user input to a dictionary but i am getting this error: 

AttributeError: 'dict' object has no attribute 'append'

This is my code so far:

    for index, elem in enumerate(main_feeds):
        print(index,":",elem)
        temp_list = index,":",elem
    li = {}
    print_user_areas(li)

    while True:
        n = (input('\nGive number: '))


        if n == "":
          break
        else:
             if n.isdigit():
               n=int(n)
               print('\n')
               print (main_feeds[n])

               temp = main_feeds[n]
               for item in user:


                  user['areas'].append[temp]

Any ideas?

Upvotes: 34

Views: 212374

Answers (4)

Marlon Garcia
Marlon Garcia

Reputation: 11

As the error and the fellows pointed out, there is no 'append' attribute to a 'dict' object.

But if you really see a Python code with the line dict["key"].append(value) working, it is because there is a list inside this key, and you want to specifically add values in the list inside the key (not to add new entries to the key itself). Then dict["key"].append(value) will work anyway.

Upvotes: 1

AnotherUsername
AnotherUsername

Reputation: 201

As the error suggests, append is not a method or attribute, meaning you cannot call append in the dictionary user. Instead of

user['areas'].append[temp]

Use

user['areas'].update[temp]

Upvotes: 4

sivi
sivi

Reputation: 11114

Either use dict.setdefault() if the key is not added yet to dictionary :

dict.setdefault(key,[]).append(value)

or use, if you already have the keys set up: 

dict[key].append(value)

source: stackoverflow answers

Upvotes: -7

Shane Williamson
Shane Williamson

Reputation: 371

Like the error message suggests, dictionaries in Python do not provide an append operation.

You can instead just assign new values to their respective keys in a dictionary.

mydict = {}
mydict['item'] = input_value

If you're wanting to append values as they're entered you could instead use a list.

mylist = []
mylist.append(input_value)

Your line user['areas'].append[temp] looks like it is attempting to access a dictionary at the value of key 'areas', if you instead use a list you should be able to perform an append operation.

Using a list instead:

user['areas'] = []

On that note, you might want to check out the possibility of using a defaultdict(list) for your problem. See here

Upvotes: 37

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