After reading http://www.python.org/doc/faq/general/#how-does-python-manage-memory, I tried modifying this program as below:
a=[]
for i in xrange(33,127):
for j in xrange(33,127):
for k in xrange(33,127):
for l in xrange(33, 127):
a.append(chr(i)+chr(j)+chr(k)+chr(l))
import sys sys.exc_clear() sys.exc_traceback = sys.last_traceback = None del(a)
import gc gc.collect()
And it still never frees up its memory.
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