help me simple code result min and max number

[abrahimusmaximus]

I have the following code:

largest = None
smallest = None
while True:
    num = input('enter a num ')
    if num == "done":
        break
    try:
        val = float(num)
    except:
        print("Invalid input")
        continue
    if largest is None or num > largest:
        print("setting largest to ", num)
        largest = num
        print("largest: ", largest)
        print('***********')
    if smallest is None or num < smallest:
        print("setting smallest to ", num)
        smallest = num
        print("smallest: ", smallest)
        print('***********')
print("Maximum is", largest)
print("Minimum is", smallest)

which produces the following output in the terminal

Output:
enter a num 7
setting largest to  7
largest:  7
***********
setting smallest to  7
smallest:  7
***********
enter a num 2
setting smallest to  2
smallest:  2
***********
enter a num bob
Invalid input
enter a num 10
setting smallest to  10
smallest:  10
***********
enter a num 4
enter a num done
Maximum is 7
Minimum is 10

two questions:

1. If I remove the continue than the largest is set to bob? Why? Why do I even need the continue? I would never expect bob to be set to the largest as largest has already been set to 7 previously (it can not be None) and bob can not be greater than largest

if largest is None or num > largest:
7 is None || "bob" > 7
False || False
I do not understand how that statement can be truthy

2. How does the final smallest get set to 10 ? it was last set to 2
is 10 less than 2?

please explain these things

In my language the below image works exactly as expected so why isnt the above code working as expected?