python实现rest请求api示例

该代码参考新浪python api,适用于各个开源api请求

代码如下:
# -*- coding: utf-8 -*-
import collections
import gzip
import urllib
import urllib2
from urlparse import urlparse

try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

try:
    import json
except ImportError:
    import simplejson as json

__author__ = 'myth'

_HTTP_GET = 1
_HTTP_POST = 2
# 超时时间（秒）
TIMEOUT = 45
RETURN_TYPE = {"json": 0, "xml": 1, "html": 2, "text": 3}
_METHOD_MAP = {'GET': _HTTP_GET, 'POST': _HTTP_POST}

class APIError(StandardError):
    """
    raise APIError if receiving json message indicating failure.
    """
    def __init__(self, error_code, error, request):
        self.error_code = error_code
        self.error = error
        self.request = request
        StandardError.__init__(self, error)

    def __str__(self):
        return 'APIError: %s: %s, request: %s' % (self.error_code, self.error, self.request)

# def callback_type(return_type='json'):
#
#     default_type = "json"
#     default_value = RETURN_TYPE.get(default_type)
#     if return_type:
#         if isinstance(return_type, (str, unicode)):
#             default_value = RETURN_TYPE.get(return_type.lower(), default_value)
#     return default_value

def _format_params(_pk=None, encode=None, **kw):
    """

    :param kw:
    :type kw:
    :param encode:
    :type encode:
    :return:
    :rtype:
    """

    __pk = '%s[%%s]' % _pk if _pk else '%s'
    encode = encode if encode else urllib.quote

    for k, v in kw.iteritems():
        _k = __pk % k
        if isinstance(v, basestring):
            qv = v.encode('utf-8') if isinstance(v, unicode) else v
            _v = encode(qv)
            yield _k, _v
        elif isinstance(v, collections.Iterable):
            if isinstance(v, dict):
                for _ck, _cv in _format_params(_pk=_k, encode=encode, **v):