New submission from Jerry Dimitrov: Hello everyone, This is my first bug report to the python project, so please excuse me if the metadata for this particular issue is not 100% accurate.
Today I noticed (with the help from couple of people in IRC) a strange behavior in the python string formatting functionality. Consider the following code snippets: ``` '%(a)s %(b)' % {'a': '1', 'b': '2'} # result: Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: incomplete format ``` ``` '%(a) %(b)s' % {'a': '1', 'b': '2'} # result: '%(b)s' # expected result: Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: incomplete format ``` It seems that there is some kind of inconsistent (undefined) behavior, during the parsing of the type character for the formatted string (tested across all major python 2.x/3.x versions). According to the documentation for string formatting and the relevant PEPs, there is no additional info about this particular case. I want to say thank you to Yhg1s, JustASlacker, Jerub and lz1irq for discovering this 'bug/feature' and the additional information about it. Please let me know if this is a bug, since I am not 100% sure if this is the case. Thanks in advance for your time! Best Regards, Jerry ---------- components: Interpreter Core messages: 287857 nosy: Jerry Dimitrov priority: normal severity: normal status: open title: undefined parsing behavior with the old style string formatting type: behavior versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29568> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com