P2 -> P3 : Errors

[wsHVM]

I have some code which I believe to be from Python 2 and need to move it to Python 3. I do not code in Python, or I stumble through very simple routines with some luck.

The code below gives me several errors in Python 3. Any suggestions or things I need to address? Any help would be greatly appreciated.

p, q = 1, 3
a, b, a1, b1 = 4, 1, 12, 4
for i in range(10000):
    p, q = p+q, q+2        # next convergent
    a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
    while 1:
        d = a//b
        r = a1 - d*b1      # break if a//b != a1//b1
        if r < 0 or r >= b1: break
        print d,           # common digits
        a, a1 = 10*(a-d*b), 10*r