'''
Design a program that allows a user to enter 20 numbers, then displays all of the numbers, 
the largest number, and the smallest.
'''
try:
    nums = []
    nums.append(float(input("Enter first number: ")))
    max = nums[0]
    min = nums[0]
    for num in range(1,20):
        nums.append(float(input("Enter number "+str(num+1))))
        if nums[num] > max:
            max = nums[num]
        elif nums[num] < min:
            min = nums[num]
    print("The 20 numbers entered are: ", nums)
    print("The maximum value is: {0:0.2f}".format(max))
    print("The minimum value is: {0:0.2f}".format(min))
except:
    print("Last entry is invalid, please enter numeric values only")