py4e 5.2 Assignment - [Solved, Working solution] [Only review after you have tried _everything_ ]

py4e_5_2.py

largest = -1
smallest = None

while True :
    num = input('Enter a number: ')

    if num == "done" :
        break
    
    try:
        i_num = int(num)
    except:
        print('Invalid input')
        continue

    if i_num > largest:
        largest = i_num

    if smallest is None :
        smallest = i_num
    elif i_num < smallest :
        smallest = i_num

print("Maximum is", largest)
print("Minimum is", smallest)       

Worked perfectly, great coding.