提交 f966b64f 编写于 作者: A
Version 3.3.3. Accomodate Python 2.7.x versions < 2.7.9.
The SSL module includes in Python versions < 2.7.9 does not include the SSLWantReadError or SSLWantWriteError exceptions. As such we can't assume they are present just because the ssl module happens to be installed. Fixes #1197
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