import subprocess

def counter(start=1):
	while True:
		yield start
		start += 1

counter = counter()
while True:
	count = next(counter)
	cmd = ['pcbuild/python', 'lib/test/regrtest.py', '-v', 'test_mailbox']
	res = subprocess.Popen(cmd).wait()
	if res != 0: break

print('ran {count} times, then failed with {res}'.format(**vars()))