On Mon, Apr 11, 2016 at 11:49 AM, Alex <nevimov at gmail.com> wrote: > https://docs.python.org/3/library/unittest.mock.html#magic-mock > ... > >> Methods and their defaults: >> ... >> __len__:1 >> ... > > Should be __len__:0 Hi Alex, Good catch, thanks for the report. Fixed in https://hg.python.org/cpython/rev/83f267ffb862 --Berker