New submission from mic_e: With a prompt that uses ANSI color escape codes, python3 input() and python2 raw_input() behave incorrectly when it comes to the wrapping of the first line - almost certainly due to the wrong string length calculation. The line breaking occurs k characters early, where k is the number of characters in the ANSI escape sequence. Even worse, the line break does not switch to the next line, but instead jumps back to the beginning, overwriting the prompt and the previously written input.
How to reproduce: Call input() with a color-coded string as argument, and type until you would expect the usual line break. Example: mic@mic-nb ~ $ python3 Python 3.3.0 (default, Dec 22 2012, 21:02:07) [GCC 4.7.2] on linux Type "help", "copyright", "credits" or "license" for more information. >>> prompt="\x1b[31;1mthis is a bold red prompt> \x1b[m" >>> len(prompt) 37 >>> input(prompt) uvwxyzs a bold red prompt> abcdefghijklmnopqrst 'abcdefghijklmnopqrstuvwxyz' >>> mic@mic-nb ~ $ python2 Python 2.7.3 (default, Dec 22 2012, 21:14:12) [GCC 4.7.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> prompt="\x1b[31;1mthis is a bold red prompt> \x1b[m" >>> len(prompt) 37 >>> raw_input(prompt) uvwxyzs a bold red prompt> abcdefghijklmnopqrst 'abcdefghijklmnopqrstuvwxyz' >>> mic@mic-nb ~ $ tput cols 57 I have typed directly after the prompt the string 'abcdefghijklmnopqrstuvwxyz', so the expected result would be be this is a bold red prompt> abcdefghijklmnopqrstuvwxyz with four more characters of space before the line break Note that the break occurs exactly 8 characters early, which is the total amount of ANSI escape sequence characters. Also note that the readline module is impored in my .pyrc file. ---------- components: Library (Lib) messages: 183323 nosy: mic_e priority: normal severity: normal status: open title: input() and raw_input() do not work correctly with colored prompts type: behavior versions: Python 2.7, Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17337> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
