2-unittech.py

import numbers
def getNumber(s):
    try:
        return int(s)
    except ValueError:
        return float(s)
flag = True
nums = []
while flag:
    try:
        num = raw_input('Give a number: ')
        if(num == "quit"):
          flag = False
        elif not isinstance(float(num), numbers.Real):
            raise Exception
        else:
            nums.append(getNumber(num))
    except:
        print('Only numbers are allowed')
print('Results:\nMaximum = ' + str(max(nums)) + '\nMinimum = ' + str(min(nums)) + '\nSum = ' + str(sum(nums)) + '\nAverage = ' + str(sum(nums)/len(nums)))