<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _assemble_linux_cmdline(kv):
 """ Given a dictionary, assemble a Linux boot command line. """

    # try to be compatible with Py2.4
    parts = []
    for k, v in kv.items():
        if v is None:
            parts.append(str(k))
        else:
            parts.append('%s=%s' % (k, v))
    return ' '.join(parts)