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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def execute_cmd(cmd, **kwargs):
 """ Call given command, yielding output line by line """

    yield '$ {}\n'.format(' '.join(cmd))
    kwargs['stdout'] = subprocess.PIPE
    kwargs['stderr'] = subprocess.STDOUT

    proc = subprocess.Popen(cmd, **kwargs)

    # Capture output for logging.
    # Each line will be yielded as text.
    # This should behave the same as .readline(), but splits on `\r` OR `\n`,
    # not just `\n`.
    buf = []
    def flush():
        line = b''.join(buf).decode('utf8', 'replace')
        buf[:] = []
        return line

    c_last = ''
    try:
        for c in iter(partial(proc.stdout.read, 1), b''):
            if c_last == b'\r' and buf and c != b'\n':
                yield flush()
            buf.append(c)
            if c == b'\n':
                yield flush()
            c_last = c
    finally:
        ret = proc.wait()
        if ret != 0:
            raise subprocess.CalledProcessError(ret, cmd)