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Hmm, when exception occurs in some frame, its reference will be
retained even after exiting function? Indeed, extra
exception fixed problem.
import os
def foo():
 io = open("a.txt", "w")
 raise RuntimeError()
try:
 foo()
except:
 pass
try:
 raise RuntimeError()
except:
 pass
os.remove("a.txt") # fine
But still I'm little confused why this code prints "del".
class A:
 def __del__(self):
 print "del"
def foo():
 a = A()
 raise RuntimeError()
try:
 foo()
except:
 pass
I found this behavior when investigating issue3210. When
Lib/subprocess.py (814)'s CreateProcess() raises exception,
p2cread will be freed by refcount GC, it never happen before
os.remove(). And this error is also fixed by same hack.
import subprocess, os
file = open("filename", "w")
try:
 proc = subprocess.Popen("nosuchprogram", stdout=file)
except OSError:
 pass
try:
 raise RuntimeError() # hack
except:
 pass
file.close()
os.remove("filename")