I am debugging a pexpect interface issue at
http://trac.sagemath.org/ticket/17686
When creating an Expect object, say "g = Gp()", doing "del g" afterwards
doesn't actually destroy the object, even if followed by "gc.collect()".
I want to understand why, in particular who keeps these Expect objects
alive. sage.interfaces.quit (used to implement quitting interfaces when
Sage quits) keeps weakrefs, so that cannot be the problem.
Example Sage session:
sage: for i in range(10):
print Gp().eval("2")
....:
2
2
2
2
2
2
2
2
2
2
sage: import gc; gc.collect()
52
sage:
Exiting Sage (CPU time 0m0.22s, Wall time 0m9.04s).
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
Exiting spawned PARI/GP interpreter process.
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