colorlog.py 文件源码

def __init__(self, color=True, datefmt=None):
        r"""
        :arg bool color: Enables color support.
        :arg string fmt: Log message format.
        It will be applied to the attributes dict of log records. The
        text between ``%(color)s`` and ``%(end_color)s`` will be colored
        depending on the level if color support is on.
        :arg dict colors: color mappings from logging level to terminal color
        code
        :arg string datefmt: Datetime format.
        Used for formatting ``(asctime)`` placeholder in ``prefix_fmt``.
        .. versionchanged:: 3.2
        Added ``fmt`` and ``datefmt`` arguments.
        """
        logging.Formatter.__init__(self, datefmt=datefmt)
        self._colors = {}
        if color and _stderr_supports_color():
            # The curses module has some str/bytes confusion in
            # python3. Until version 3.2.3, most methods return
            # bytes, but only accept strings. In addition, we want to
            # output these strings with the logging module, which
            # works with unicode strings. The explicit calls to
            # unicode() below are harmless in python2 but will do the
            # right conversion in python 3.
            fg_color = (curses.tigetstr("setaf") or
                        curses.tigetstr("setf") or "")
            if (3, 0) < sys.version_info < (3, 2, 3):
                fg_color = str(fg_color, "ascii")

            for levelno, code in self.DEFAULT_COLORS.items():
                self._colors[levelno] = str(curses.tparm(fg_color, code), "ascii")
            self._normal = str(curses.tigetstr("sgr0"), "ascii")

            scr = curses.initscr()
            self.termwidth = scr.getmaxyx()[1]
            curses.endwin()
        else:
            self._normal = ''
            # Default width is usually 80, but too wide is worse than too narrow
            self.termwidth = 70