[Python] Understanding comprehension sets

I have this code:

class ApiCall(object):

def __init__(self, url):
self.url = url

def call(self):
call = requests.get(self.url)
response = call.content.decode('utf-8')
result = json.loads(response)
return result


class IncomeSources(object):

def __init__(self, result):
self.result = result

def all(self):
#This is the dict comprehension
#return {(slot['accountLabelType'], slot['totalPrice']) for slot in self.result}

for slot in self.result:

return (slot['accountLabelType'], slot['totalPrice'])

def main():
url = ('https://datafeed/api/')
api_result = ApiCall(url).call()
target = IncomeSources(api_result).all()
print(target)


main()


The result with a regular for on a function, returns this which is not desired, as it only returns the pair of the first object:

('Transport', 888)


But with the dict comprehension, it returns all slot pairs of all the JSON objects on that JSON response (that is cool). Why does the dict comprehension grab all the pairs and the regular for does not?

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