<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def create_virtualenv(venvpath, venvargs=None):
    '''
    Run virtualenv from downloaded venvpath using venvargs
    If venvargs is None, then 'venv' will be used as the virtualenv directory

    :param str venvpath: Path to root downloaded virtualenv package(must contain
        virtualenv.py)
    :param list venvargs: Virtualenv arguments to pass to virtualenv.py
    '''
    cmd = [join(venvpath, 'virtualenv.py')]
    venv_path = None
    if venvargs:
        cmd += venvargs
        venv_path = abspath(venvargs[-1])
    else:
        cmd += ['venv']
    p = subprocess.Popen(cmd)
    p.communicate()