mins_by_phone(phone): calculate and return the number of call minutes associated with the given phone line in this plan based on

def mins_by_phone(phone):

   if phone in self.phones:

       min_sum = 0

       for call in calls:

           min_sum += call

           return min_sum

   else:

       return 0

Explanation:

The mins_by_phone function above is the Phone class method. It checks for the presence of the argument value in the self.phones instance variable, which is a list and  sums up and returns the call minutes in the call list.

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answer; the above statement is (true);