Dynamic printing of recurring information to a single line.

gistfile1.py

class ProgressPrinter(object):
    """
    Write a recurring message to a stream on the same line.

    Warning
    -------
    Only works properly if the message fits on a single line for the given
    stream.
    """

    def __init__(self, stream=sys.stdout, sep=" ", **kw_args):
        super(ProgressPrinter, self).__init__(**kw_args)
        self.stream = stream
        self.sep = sep

    def __call__(self, msg, *args):
        self.stream.write("\r\x1b[K")
        self.stream.write(msg)
        if args:
            self.stream.write(self.sep)
            self.stream.write(self.sep.join(args))
        self.stream.flush()

    def close(self):
        self.stream.write("\n")