execfile eats memory

[jepler at unpythonic.net]

I generated a ~22-megabyte file with this small Python program:
	print "["
	for i in xrange(2000000):
	    print "'" + str(i) + "', "
	print "]"

As the original poster suggested, Python uses at least several hundreds
of megabytes when execfile()ing that source.  I had to kill the program
before it exited because it brought my computer (1GB RAM) to a standstill.

Jeff
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