r = requests.get(url, params='format=json&key=site:dummy+type:example+group:wheel')
顺便说一句:
payload = {'format': 'json', 'key': 'site:dummy+type:example+group:wheel'}
payload_str = "&".join("%s=%s" % (k,v) for k,v in payload.items())
# 'format=json&key=site:dummy+type:example+group:wheel'
r = requests.get(url, params=payload_str)