l = [ 1, 2, 3 ]
i = l.__iter__()
s = None
while True :
  if s :
    print s
  try :
    s = i.next()
  except StopIteration :
    break
print "done"

[stdout:]1
[stdout:]2
[stdout:]3
None['Traceback (most recent call last):
', '  File "test_python.py", line 8, in <module>
    s = i.next()
', 'StopIteration
']

s = ""
while True :
  if state is STATE_CODE :
    if "//" in s :
      tokens.add( TOKEN_COMMENT, s.split( "//" )[1] )
      state = STATE_COMMENT
    else :
      tokens.add( TOKEN_CODE, s )
  if state is STATE_COMMENT :
    if "//" in s :
      tokens.append( TOKEN_COMMENT, s.split( "//" )[1] )
    else
      state = STATE_CODE
      # re-evaluate same line
      continue
  try :
    s = i.next()
  except StopIteration :
    break

while True:
  stuff()
  if fail_condition:
    break

stuff()
while not fail_condition:
  stuff()

for i in l:
  print i
print "done"

for s in l:
  while True:
    stuff()
    # use a "break" instead of s = i.next()

for s in some_list:
  while True :
    if state is STATE_CODE :
      if "//" in s :
        tokens.add( TOKEN_COMMENT, s.split( "//" )[1] )
        state = STATE_COMMENT
      else :
        tokens.add( TOKEN_CODE, s )
    if state is STATE_COMMENT :
      if "//" in s :
        tokens.append( TOKEN_COMMENT, s.split( "//" )[1] )
        break # get next s
      else
        state = STATE_CODE
        # re-evaluate same line
        # continues automatically

condition = True
while (condition):
    # loop body here
    condition = test_loop_condition()
# end of loop

try:
  while True:
    if s:
      print s
    s = i.next()
except StopIteration:
  pass

def coroutine(func):
    """Coroutine decorator

    Coroutines must be started, advanced to their first "yield" point,
    and this decorator does this automatically.
    """
    def startcr(*ar, **kw):
        cr = func(*ar, **kw)
        cr.next()
        return cr
    return startcr

@coroutine
def collector(storage):
    """Act as "sink" and collect all sent in @storage"""
    while True:
        storage.append((yield))

@coroutine
def state_machine(sink):
    """ .send() new parts to be tokenized by the state machine,
    tokens are passed on to @sink
    """
    s = ""
    state = STATE_CODE
    while True:
        if state is STATE_CODE :
            if "//" in s :
                sink.send((TOKEN_COMMENT, s.split( "//" )[1] ))
                state = STATE_COMMENT
            else :
                sink.send(( TOKEN_CODE, s ))
        if state is STATE_COMMENT :
            if "//" in s :
                sink.send(( TOKEN_COMMENT, s.split( "//" )[1] ))
            else
                state = STATE_CODE
                # re-evaluate same line
                continue
        s = (yield)

tokens = []
sm = state_machine(collector(tokens))
for piece in i:
    sm.send(piece)

do {
  stuff()
} while (condition())

while True:
  stuff()
  if not condition():
    break

def do_while(stuff, condition):
  while condition(stuff()):
    pass

while condition is True:
  stuff()
else:
  stuff()

loop = True
while (loop):
    generic_stuff()
    try:
        questionable_stuff()
#       to break from successful completion
#       loop = False
    except:
        optional_stuff()
#       to break from unsuccessful completion -
#       the case referenced in the OP's question
        loop = False
   finally:
        more_generic_stuff()

while (True):
    generic_stuff()
    try:
        questionable_stuff()
#       to break from successful completion
#       break
    except:
        optional_stuff()
#       to break from unsuccessful completion -
#       the case referenced in the OP's question
        break

flagBreak = false;
while True :

if(flagBreak ) break;

  if s :
    print s
  try :
    s = i.next()
  except StopIteration :
    flagBreak = true;
print "done"

for s in l :
    print s
print "done"