progress_bar.py 文件源码

def write(self, data):
        if not data.rstrip("\n"):
            return

        f = self._file
        cols = get_terminal_size().columns
        # Clear the last line.
        f.write("\r" + " " * (cols-1))
        f.flush()
        # Return and write the data.
        out = "\r" + data
        if not out.endswith("\n"):
            out += "\n"
        f.write(out)

        # Write our string.
        f.write(self.line + "\r")
        f.flush()