import sys
import time

class Baz:
    def hello(self):
        print(foo)

if True:
  foo = 'bar'

print("hello, {0}".format('world!'))
c = Baz()
c.hello()



success = False
retry = 3
while not success and retry > 0:
  try:
    #raise Exception('my')
    success = True
  except Exception as e:
    print(e, file=sys.stderr)
    time.sleep(1)
    retry = retry - 1