python URL請求地址的拼接

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)

輸出結果：
http://127.0.0.1/version?platform=windows_64bit&object=agent&version=20160216
http://127.0.0.1/version?os_type=win_xp