import _winreg, thread, time

short_string = '1'
long_string = '1'*2000
done = False

def create_key():
       root = _winreg.HKEY_CURRENT_USER
       key = _winreg.OpenKey(root, 'PythonTestKeys')
       for i in range(10000):
              if done: break
              if i & 1:
                     s = short_string
              else:
                     s = long_string
              _winreg.SetValue(key, 'test', _winreg.REG_SZ, s)

thread.start_new_thread(create_key, ())

def subkeys(key):
       num_subkeys, num_values, t = _winreg.QueryInfoKey(key)
       for i in range(num_values):
              name = _winreg.EnumValue(key, i)
       for i in range(num_subkeys):
              name = _winreg.EnumKey(key, i)
              try:
                     subkey = _winreg.OpenKey(key, name)
              except WindowsError:
                     continue
              subkeys(subkey)
              subkey.Close()

root = _winreg.HKEY_CURRENT_USER
key = _winreg.CreateKey(root, 'PythonTestKeys')

try:
       for i in range(10000):
              subkeys(key)
finally:
       # cleanup
       done = True
       time.sleep(1)
       key = _winreg.DeleteKey(root, 'PythonTestKeys\\test')
       key = _winreg.DeleteKey(root, 'PythonTestKeys')