def list_to_string(list_, **kwargs):
    """Convert list_ into string. Accepts keyword 'join', default linebreak."""
    ## http://www.decalage.info/en/python/print_list_
    ## http://stackoverflow.com/questions/1769403/understanding-kwargs-in-python
    ## str.strip -- http://stackoverflow.com/questions/7984169/using-strip-on-lists
    results = ''
    jointoken = '\n'
    if ('join' in kwargs): # http://stackoverflow.com/questions/14017996/python-optional-parameter
        jointoken = kwargs['join']
    list_ = map(str, list_)       ## convert any ints into strings
    list_ = map(str.strip, list_) ## strip whitespace
    list_ = jointoken.join(list_)      ## join list items into multi-line string
    results = list_
    return results