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The computation of `co_stacksize' by the compiler is known to give only an upper bound estimate. http://bugs.python.org/issue1754094 is an example of fixing a "leak" where every repetition of a statement makes `co_stacksize' bigger by 1. However, in the whole 3.x series (from at least 3.2), the following simple code, which at runtime requires about 4 or 5 stack slots, leaks 14(!) slots for every `try:' block. Maybe this should be improved to reduce the extreme size of the leak.
def g():
 try: pass
 except ImportError as e: pass
 try: pass
 except ImportError as e: pass
 try: pass
 except ImportError as e: pass
 ...
i.e. any function that is big enough to contain 6 try: blocks in sequence will have its stack size overestimated by about 70.