code_str = """if if1:
  if1_entered = 1

if if2:
  if subif1:
    subif1_entered = 1
  elif subif2:
    subif2_entered = 1

  subif_ended = 1
"""

import compiler
import dis

tree_set = set()
lnotab_code_dict = {}
for _ in range(1000):
  gen = compiler.pycodegen.Module(code_str, "")
  tree_set.add(repr(gen._get_tree()))

  gen.compile()
  l = []
  for t in dis.findlinestarts(gen.code):
    l.append(t)

  lnotab_code_dict[tuple(l)] = gen.code

if len(tree_set) != 1:
  import pprint
  pprint.pprint(tree_set)

if len(lnotab_code_dict) != 1:
  for lnotab, code in lnotab_code_dict.iteritems():
    print "===================================="
    dis.dis(code)