The default value of __len__ is 0, not 1:
>>> from unittest.mock import MagicMock
>>> mock = MagicMock()
>>> len(mock)
0
Reported by Alex on docs@p.o.
Remove the remaining VMSError reference. VMS support is gone.
.. versionchanged:: 3.3
:exc:`EnvironmentError`, :exc:`IOError`, :exc:`WindowsError`,
- :exc:`VMSError`, :exc:`socket.error`, :exc:`select.error` and
+ :exc:`socket.error`, :exc:`select.error` and
:exc:`mmap.error` have been merged into :exc:`OSError`, and the
constructor may return a subclass.
* ``__ge__``: NotImplemented
* ``__int__``: 1
* ``__contains__``: False
-* ``__len__``: 1
+* ``__len__``: 0
* ``__iter__``: iter([])
* ``__exit__``: False
* ``__complex__``: 1j