Davin Potts added the comment: To be fair, the docs in 2.7 do actually mention the use of 'block' instead of 'blocking' in acquire though it does so inside a "Note" block a bit later in the docs after first claiming that multiprocessing.Lock is a "clone". In 3.4, that important detail has been inexplicably stripped from this distended "Note" block. Ultimately, this use of the "Note" block seems to misplace important information that should appear in the description of the multiprocessing.Lock class and its siblings in the synchronization section. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue23484> _______________________________________