Sum of each item in For Loop

January 28, 2022

I’m a total beginner with Python/Django and this is probably a really easy thing to do, but i can’t work out how.

I have a view that carries out some calculations within a for loop each loop creates a "value":value pair. I’m trying to add up all the values to create total.

for item in list:
    value = round(holding.price * price, 3)
    results.append({'value':value})

total = # How?

I’ve tried to loop through results, but I think because results is a list of dictionaries it doesn’t work.

Is there an easy way?

>Solution :

You can use a list comprehension to put the value properties into a list, and then sum that list:

results = []
for item in lst:
    value = round(holding.price * price, 3)
    results.append({'value': value})

total = sum([dct['value'] for dct in results])
print(total)