CODEWITHSUNDEEP
pythonlistdictionaryif-statementconditional-statements
corianne1234
corianne1234

Reputation: 724

adding elements to list based on a condition

I have a dictionary params. Now I would like to create a list (of dictionaries) from params. This list has either one or two elements as sometimes I dont have both key/value pairs in params. So I would like to only add these element to the list if they exist in params. Is there a simple way to do that? I mean I know I could do an if else statement but I would like to use as little code as possible.

params={'key1':'bla1', 'key2':'bla2'}

I know this works but is there something with less code

if 'key1' not in params:
    list_ = [{'val2': params['key2']}]
elif 'key2' not in params:
    list_ = [{'val1': params['key1']}]
else:
    list_ = [{'val1': params['key1']}, {'val2': params['key2']}]

Upvotes: 0

Views: 230

Answers (1)

manu190466
manu190466

Reputation: 1603

You can use a list comprehension :

list_ = [{k:v} for k,v in params.items()]

Then rename the keys at the end :

list_['val1']=list_['key1']
del list_['key1']

list_['val2']=list_['key2']
del list_['key2']

Or you can just rename the keys during the list comprehension with a dictionnary giving the actual keys.

names={'key1':'val1', 'key2':'val2'}
list_ = [{names[k]:v} for k,v in params.items()]

Upvotes: 1

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