python-ldap now supports both Python 2 and 3. The pyldap package is
deprecated. The project recommends switching to python-ldap instead.
From the github page:

https://github.com/pyldap/pyldap

> THIS FORK IS DEPRECATED
>
> The pyldap fork was merged back into python-ldap, and released as
> python-ldap 3.0.0b1.

Allows code that was previous written as:

  mock = MockLdap(...)
  mock.start()
  try:
      ...
  finally:
      mock.stop()

To now be written as:

  with MockLdap(...):
      ...

For information on the with statement and context managers, see:

https://docs.python.org/3/reference/datamodel.html#context-managers
https://docs.python.org/3/reference/compound_stmts.html#with

Some of the code is reorganized to match python-ldap's organization. It's not in any sense usable yet.