python处理multipart/form-data的请求方法

import requestsurl = "http://www.xxxx.net/login"#参数拼凑,附件上传格式如picurl参数，其他表单参数值拼成tuple格式：2-tuples (filename, fileobj), 3-tuples (filename, fileobj, contentype)，4-tuples (filename, fileobj, contentype, custom_headers)files = {"username": (None, "billy"), "password": (None, "abcd1234"),  'picUrl': ('pic.png', open('E://download//pic.png', 'rb'), 'image/png')}#如需headers，不需要赋值Content-Type,不然可能会报错res = requests.post(url, files=files)print res.request.bodyprint res.request.headers

from requests_toolbelt import MultipartEncoderimport requestsm = MultipartEncoder( fields={'field0': 'value', 'field1': 'value',   'field2': ('filename', open('file.py', 'rb'), 'text/plain')}， )r = requests.post('http://httpbin.org/post', data=m,     headers={'Content-Type': m.content_type})

from requests_toolbelt import MultipartEncoderimport requestsm = MultipartEncoder(fields={'field0': 'value', 'field1': 'value'})r = requests.post('http://httpbin.org/post', data=m,     headers={'Content-Type': m.content_type})