old_contents: from __future__ import unicode_literals, print_function
  
  from inspect import getsource
  import os
  from os.path import dirname as dirn
  import sys
  
  print('WARNING: Lazy loading extractors is an experimental feature that may not always work', file=sys.stderr)
  
  sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
  
  lazy_extractors_filename = sys.argv[1]
  if os.path.exists(lazy_extractors_filename):
      os.remove(lazy_extractors_filename)
  
  from youtube_dl.extractor import _ALL_CLASSES
  from youtube_dl.extractor.common import InfoExtractor
  
  with open('devscripts/lazy_load_template.py', 'rt') as f:
      module_template = f.read()
  
  module_contents = [module_template + '\n' + getsource(InfoExtractor.suitable)]
  
  ie_template = '''
  class {name}(LazyLoadExtractor):
      _VALID_URL = {valid_url!r}
      _module = '{module}'
  '''
  
  make_valid_template = '''
      @classmethod
      def _make_valid_url(cls):
          return {valid_url!r}
  '''
  
  
  def build_lazy_ie(ie, name):
      valid_url = getattr(ie, '_VALID_URL', None)
      s = ie_template.format(
          name=name,
          valid_url=valid_url,
          module=ie.__module__)
      if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
          s += '\n' + getsource(ie.suitable)
      if hasattr(ie, '_make_valid_url'):
          # search extractors
          s += make_valid_template.format(valid_url=ie._make_valid_url())
      return s
  
  names = []
  for ie in list(sorted(_ALL_CLASSES[:-1], key=lambda cls: cls.ie_key())) + _ALL_CLASSES[-1:]:
      name = ie.ie_key() + 'IE'
      src = build_lazy_ie(ie, name)
      module_contents.append(src)
      names.append(name)
  
  module_contents.append(
      '_ALL_CLASSES = [{0}]'.format(', '.join(names)))
  
  module_src = '\n'.join(module_contents) + '\n'
  
  with open(lazy_extractors_filename, 'wt') as f:
      f.write(module_src)
  
new_contents: from __future__ import unicode_literals, print_function
  
  from inspect import getsource
  import os
  from os.path import dirname as dirn
  import sys
  
  print('WARNING: Lazy loading extractors is an experimental feature that may not always work', file=sys.stderr)
  
  sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
  
  lazy_extractors_filename = sys.argv[1]
  if os.path.exists(lazy_extractors_filename):
      os.remove(lazy_extractors_filename)
  
  from youtube_dl.extractor import _ALL_CLASSES
  from youtube_dl.extractor.common import InfoExtractor, SearchInfoExtractor
  
  with open('devscripts/lazy_load_template.py', 'rt') as f:
      module_template = f.read()
  
  module_contents = [
      module_template + '\n' + getsource(InfoExtractor.suitable) + '\n',
      'class LazyLoadSearchExtractor(LazyLoadExtractor):\n    pass\n']
  
  ie_template = '''
  class {name}({bases}):
      _VALID_URL = {valid_url!r}
      _module = '{module}'
  '''
  
  make_valid_template = '''
      @classmethod
      def _make_valid_url(cls):
          return {valid_url!r}
  '''
  
  
  def get_base_name(base):
      if base is InfoExtractor:
          return 'LazyLoadExtractor'
      elif base is SearchInfoExtractor:
          return 'LazyLoadSearchExtractor'
      else:
          return base.__name__
  
  
  def build_lazy_ie(ie, name):
      valid_url = getattr(ie, '_VALID_URL', None)
      s = ie_template.format(
          name=name,
          bases=', '.join(map(get_base_name, ie.__bases__)),
          valid_url=valid_url,
          module=ie.__module__)
      if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
          s += '\n' + getsource(ie.suitable)
      if hasattr(ie, '_make_valid_url'):
          # search extractors
          s += make_valid_template.format(valid_url=ie._make_valid_url())
      return s
  
  # find the correct sorting and add the required base classes so that sublcasses
  # can be correctly created
  classes = _ALL_CLASSES[:-1]
  ordered_cls = []
  while classes:
      for c in classes[:]:
          bases = set(c.__bases__) - set((object, InfoExtractor, SearchInfoExtractor))
          stop = False
          for b in bases:
              if b not in classes and b not in ordered_cls:
                  if b.__name__ == 'GenericIE':
                      exit()
                  classes.insert(0, b)
                  stop = True
          if stop:
              break
          if all(b in ordered_cls for b in bases):
              ordered_cls.append(c)
              classes.remove(c)
              break
  ordered_cls.append(_ALL_CLASSES[-1])
  
  names = []
  for ie in ordered_cls:
      name = ie.__name__
      src = build_lazy_ie(ie, name)
      module_contents.append(src)
      if ie in _ALL_CLASSES:
          names.append(name)
  
  module_contents.append(
      '_ALL_CLASSES = [{0}]'.format(', '.join(names)))
  
  module_src = '\n'.join(module_contents) + '\n'
  
  with open(lazy_extractors_filename, 'wt') as f:
      f.write(module_src)
  
subject: Fix after commit 6e6b9f600f2f447604f6108fb6486b73cc25def1