[issue3321] _multiprocessing.Connection() doesn't check handle

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Why don't you check the file descriptor directly in connection_new()? 
conn->handle is read only and so can't be changed before the call to 
poll(). So other methods will also be "protected" and the error will 
be raised earlier.

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