[issue10093] Warn when files are not explicitly closed

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> If a new, unbound socket uses some form of OS resource, then a warning
> is needed. Is their an equivalent limitation like there is with file
> descriptors as to how many an OS can possibly have open at once?

A socket *is* a file descriptor (under Unix), so, yes, there is a limit.

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<http://bugs.python.org/issue10093>
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