How to implement this for loop in Python

Im trying to implement Radix Sort in Python. In the main Radix Sort function there is a for loop like this:

m = Maximum element in a given array
for(p = 1; m/p > 0; p*10)
{
    do stuff;
}

i did implement it using a while loop like below:

p = 1
while m / p > 0:
    p *= 10
    do stuff;

But since for loop is faster than while loop, I wonder how to implement that pseudocode in Python with a for loop. Any suggestions?

Note: Radix Sort uses counting sort to sort based on digits starting from the right most digit (p=1) to the last digit and that’s why for loop is used.

Answer

Well after doing a research on the loops topic, i found that using a string instead of doing calculation is much faster. It is not the correct answer but it is the fastest implementation in Python.

for _ in range(len(str(m)):
    do stuff