Requests 是一个 Python 的 HTTP 客户端库。
Requests 2.0.0 发布了，改进内容包括：
API Changes:
Keys in the Headers dictionary are now native strings on all Python versions, i.e. bytestrings on Python 2, unicode on Python 3.
Proxy URLs now must have an explicit scheme. A MissingSchema exception will be raised if they don’t.
Timeouts now apply to read time if Stream=False.
RequestException is now a subclass of IOError, not RuntimeError.
Added new method to PreparedRequest objects: PreparedRequest.copy().
Added new method to Session objects: Session.update_request(). This method updates a Request object with the data (e.g. cookies) stored on the Session.
Added new method to Session objects: Session.prepare_request(). This method updates and prepares a Request object, and returns the corresponding PreparedRequest object.
Added new method to HTTPAdapter objects: HTTPAdapter.proxy_headers(). This should not be called directly, but improves the subclass interface.
httplib.IncompleteRead exceptions caused by incorrect chunked encoding will now raise a Requests ChunkedEncodingError instead.
Invalid percent-escape sequences now cause a Requests InvalidURL exception to be raised.
HTTP 208 no longer uses reason phrase "im_used". Correctly uses "already_reported".
HTTP 226 reason added ("im_used").
Bugfixes:
Vastly improved proxy support, including the CONNECT verb. Special thanks to the many contributors who worked towards this improvement.
Cookies are now properly managed when 401 authentication responses are received.
Chunked encoding fixes.
Support for mixed case schemes.
Better handling of streaming downloads.
Retrieve environment proxies from more locations.
Minor cookies fixes.
Imroved redirect behaviour.
Improved streaming behaviour, particularly for compressed data.
Miscellaneous small Python 3 text encoding bugs.
.netrc no longer overrides explicit auth.
Cookies set by hooks are now correctly persisted on Sessions.
Fix problem with cookies that specify port numbers in their host field.
BytesIO can be used to perform streaming uploads.
More generous parsing of the no_proxy environment variable.
Non-string objects can be passed in data values alongside files.
官方首页：https://github.com/kennethreitz/requests
来自:开源中国社区
