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title='fileno argument to socket.socket is not validated'updated_at=<Date2018-12-17.13:08:34.186>user='https://github.com/dimaqq'
Resulting in a socket object that will fail at runtime.
One of the implications is that it's possible to "steal" file descriptor, i.e. create a socket for an fd that doesn't exist; then some other function/thread happens to create e.g. socket with this specific fd, which can be "unexpectedly" used (or closed or modified, e.g. non-blocking changed) through the first socket object.
Additionally if the shorthand is used, the exception raised in these cases has odd text, at least it was misleading for me.
OSError: [Errno 9] Bad file descriptor: 'family'
I thought that I had a bug whereby a string was passed in instead of an int fd;
Ultimately I had to look in cpython source code to understand what the "family" meant.