old_contents: import collections
  import os
  import site
  import stat
  import sys
  import sysconfig
  
  SITE_PACKAGES_PATHS = set()
  for scheme in sysconfig.get_scheme_names():
      for name in ['platlib', 'purelib']:
          try:
              SITE_PACKAGES_PATHS.add(sysconfig.get_path(name, scheme))
          except KeyError:
              pass
  if hasattr(site, 'getsitepackages'):
      SITE_PACKAGES_PATHS.update(site.getsitepackages())
  if hasattr(site, 'getusersitepackages'):
      SITE_PACKAGES_PATHS.add(site.getusersitepackages())
  if sys.version_info < (3, 10):
      from distutils.sysconfig import get_python_lib
  
      SITE_PACKAGES_PATHS.add(get_python_lib())
  SITE_PACKAGES_PATHS.add(os.path.dirname(os.path.dirname(__file__)))
  SITE_PACKAGES_PATHS = tuple(SITE_PACKAGES_PATHS)
  
  SYS_PREFIX_PATHS = {
      '<frozen zipimport>',
      '<frozen importlib._bootstrap>',
      '<frozen importlib._bootstrap_external>',
      sys.prefix,
      sys.exec_prefix,
      os.path.dirname(os.__file__),
      os.path.dirname(stat.__file__),
      os.path.dirname(collections.__file__),
  }
  for prop in 'real_prefix', 'real_exec_prefix', 'base_prefix', 'base_exec_prefix':
      if hasattr(sys, prop):
          SYS_PREFIX_PATHS.add(getattr(sys, prop))
  
  SYS_PREFIX_PATHS = tuple(sorted(SYS_PREFIX_PATHS, key=len, reverse=True))
  
new_contents: import collections
  import os
  import site
  import stat
  import sys
  import sysconfig
  
  SITE_PACKAGES_PATHS = set()
  for scheme in sysconfig.get_scheme_names():
      if scheme == 'posix_home':
          # it would appear this scheme is not for site-packages
          continue
      for name in ['platlib', 'purelib']:
          try:
              SITE_PACKAGES_PATHS.add(sysconfig.get_path(name, scheme))
          except KeyError:
              pass
  if hasattr(site, 'getsitepackages'):
      SITE_PACKAGES_PATHS.update(site.getsitepackages())
  if hasattr(site, 'getusersitepackages'):
      SITE_PACKAGES_PATHS.add(site.getusersitepackages())
  if sys.version_info < (3, 10):
      from distutils.sysconfig import get_python_lib
  
      SITE_PACKAGES_PATHS.add(get_python_lib())
  SITE_PACKAGES_PATHS.add(os.path.dirname(os.path.dirname(__file__)))
  SITE_PACKAGES_PATHS = tuple(SITE_PACKAGES_PATHS)
  
  SYS_PREFIX_PATHS = {
      '<frozen zipimport>',
      '<frozen importlib._bootstrap>',
      '<frozen importlib._bootstrap_external>',
      sys.prefix,
      sys.exec_prefix,
      os.path.dirname(os.__file__),
      os.path.dirname(stat.__file__),
      os.path.dirname(collections.__file__),
  }
  for prop in 'real_prefix', 'real_exec_prefix', 'base_prefix', 'base_exec_prefix':
      if hasattr(sys, prop):
          SYS_PREFIX_PATHS.add(getattr(sys, prop))
  
  SYS_PREFIX_PATHS = tuple(sorted(SYS_PREFIX_PATHS, key=len, reverse=True))
  
subject: Exclude this scheme, it's never site-packages.