This is what you can do if you want to compute the sum and the mean after the loop ends:
nums = []
while 1:
NumCalc = input ("Enter Number:")
if NumCalc == "done": break
nums.append(float(NumCalc))
print('Sum:', sum(nums), 'and average:', sum(nums)/len(nums))
While in a loop:
s = 0.0
counter = 0
while 1:
NumCalc = input("Enter Number: ")
if NumCalc == "done":
break
NumCalc = float(NumCalc)
s += NumCalc
counter += 1
print('Sum is', s, 'and the mean is', s/counter)
Output:
Enter Number: 5
Sum is 5.0 and the mean is 5.0
Enter Number: 2
Sum is 7.0 and the mean is 3.5
Enter Number: 4
Sum is 11.0 and the mean is 3.66666666667
Enter Number: 6
Sum is 17.0 and the mean is 4.25
Enter Number: 2
Sum is 19.0 and the mean is 3.8