将参数传递给命令的行中的Python错误

Question

这个错误意味着什么？

TypeError：无法连接'str'和'set'对象。

def main():
    print 'ffffffffffffffffffffffffff'
    try:
        print getopt.getopt(sys.argv[1:], 'u:a:s:', ['help', 'output='])
        opts, args = getopt.getopt(sys.argv[1:], 'u:a:s:', ['help', 'output='])
        print opts, args,'print'
    except getopt.GetoptError, err:
        print str(err)
        sys.exit(2)

baseUrl = 'http://10.176.14.26:8080/client/api'
cmd = {'command : listTemplates', 'templatefilter : executable'}
api = 'Qo9Qwfatwz9ARB328Btn9PftzL2Cf5LOWd8OFyJmiM513tpTIm-zKxJoWkWqf353Df397xcLdKXGk8_JO8nM3Q'
secret = '-kgkBuBUrGFeIC4gUvngSK_3Ypmi7fuF8XdVXIusnyyiEP2YUcG3FnPUGJGy3rp3Bw5ZNnqgS-9tIfyV1QnK1g'