Ben Darnell added the comment:
I agree that SSLError should have used a different attribute, but it's too late
for that - changing it would break any code currently relying on SSL errnos (in
particular asynchronous code using the SSL_ERROR_WANT_{READ,WRITE} error codes
for normal operation).
errno_scope is better than checking for isinstance(SSLError) because it lets
code that only wants posix errno to say so, instead of having to know about and
blacklist every OSError subclass that abuses the errno attribute (is SSLError
the only one?)
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<http://bugs.python.org/issue23588>
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