New submission from Damien Nadé <bugzilla-pyt...@livna.org>: While we can iterate on a mock_open handle, it is not actually possible to perform a next() on it.
My use case is the following: I have a file with a one-line header that I want to skip. So, roughly, my code is like with open(filename, 'r') as my_file: confirm_header(next(my_file)) for line in my_file: do_something(line) And while writing a unit test on this code, the handle returned by mock_open(read_data=my_read_data) returns a mock instead of the first line of my_read_data. ---------- components: Library (Lib) messages: 343177 nosy: Anvil priority: normal severity: normal status: open title: make unittest.mock.mock_open honor next() type: enhancement versions: Python 3.7, Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37008> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com