A simple program that uses a formula for PPT generation.

ppt.py

for s in range(3, 23, 2):
    for t in range(1, s, 2):
        divides = False
        for d in range(2, t + 1):
            if s % d == 0 and t % d == 0:
                divides = True 
                break
        if divides: continue 
        c = int((s**2 + t**2)/2)
        b = int((s**2 - t**2)/2)
        a = int(s*t)
        if a > 0 and b > 0 and c > 0:
            print(a, b, c)