CODEWITHSUNDEEP
pythonlistdictionary
RachelC
RachelC

Reputation: 11

Python - How to turn an integer into a list inside of a dictionary

I have a dict containing 2 key-value pairs, one is a list

dict_special =
{'money' : 100,
'sweets' : ['bonbons','sherbet', 'toffee','pineapple cube']}

I would like to turn the first value into a list also, so I can append items

i.e.

dict_special =
{'money' : [100, 250, 400]
'sweets' : ['bonbons','sherbet', 'toffee','pineapple cube']}

This is what I have tried so far:

newlist = [dict_special['money']]
newlist.append(250)
dict_special['money'] = newlist

But I feel that there must be a more succinct and Pythonic way to get there. Any suggestions?

Upvotes: 0

Views: 170

Answers (2)

abarnert
abarnert

Reputation: 365925

A more concise way to write this:

newlist = [dict_special['money']]
newlist.append(250)
dict_special['money'] = newlist

… would be:

dict_special['money'] = [dict_special['money'], 250]

However, it's worth looking at why you're trying to do this. How did you create the dict in the first place? Maybe you should have been creating it with [100] in the first place, instead of 100. If not, maybe you should have another step for converting the input dictionary (with 100) into the one you want to use (with [100]) generically rather than doing it on the fly here. Maybe you even want to use a "multidict" class instead of using a dict directly.

Without knowing more about your code and your problem, it's hard to say, but trying to make these kinds of changes in an ad-hoc way is usually a sign that something is wrong somewhere else in the code.

Upvotes: 2

Joel Cornett
Joel Cornett

Reputation: 24788

How about:

newList = {key: value if isinstance(value, list) else [value] 
           for key, value in dict_special.items()}

Upvotes: 0

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