Help change from a while loop to a for loop

[captwiggum]

Hi,
I'm a total beginner and for class I have to change this while loop to a for loop and I just can't figure it out, help would be much appreciated.
It is a simple function to count the number of digits in a number. This is what I have.
Thanks

def displayDigits(number):
    counter = 0
    while(number > 0):
        number = number // 10
        counter = counter + 1
    print(counter)

displayDigits(26)