python URL请求地址的拼接

URL = "http://127.0.0.1/version"
dicts = {'platform': 'windows_64bit', 'object': 'agent', 'version': '20160216'}
os_type={"os_type":"win_xp"}
def parse_url(data={}):
item=data.items()
urls="?"
for i in item:
(key,value)=i
temp_str = key+"="+value
urls = urls + temp_str+"&"
urls = urls[:len(urls)-1]
return urls
print URL + parse_url(dicts)
print URL + parse_url(os_type)

输出结果： http://127.0.0.1/version?platform=windows_64bit&object=agent&version=20160216 http://127.0.0.1/version?os_type=win_xp