Is there a specialist in error handling ?

[sylas]

my question here:Hi all. I should be very glad if you help me using error handling

# file2.py
size = 40
print("here is the addition of many numbers (even with a .) Maximum of numbers=", size)
print("Once you have finished your list of numbers, just press $ to indicate the end\n")
total = 0.0
value = 0.0
count = 1
while (count != 0):
   value = float(input("enter the value: "))
   if value == '$':
       average = total / count
       print("average value= ", average)
       exit()
   else:
       print(value)
       print(total)
       total = value + total
       print(total)
       count = count + 1

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