The socket package has no sslerror module

[Pantoofle]

imaplib2/imaplib2/imaplib2.py

Line 510 in a7eb3b6

raise socket.sslerror("Invalid SSL version '%s' requested for tls_version '%s'" % (self.ssl_version, self.tls_level))

The socket package has no sslerror module (see the doc here)
The ssl package has something close. Maybe there were a confusion between the two packages ?

So if an invalid ssl_version is given, the program crashes before raising the error.

[piyueh]

Yah, that's from Python 2's socket module and does not exist anymore in Python 3:
https://github.com/python/cpython/blob/8d21aa21f2cbc6d50aab3f420bb23be1d081dac4/Lib/socket.py#L67

PR's welcome!