Larry Hastings <la...@hastings.org> added the comment:

The rationale: without this information, it is impossible for anybody else to 
write a bytecode compiler / assembler, because when you create a code object 
you have to specify its stack depth.  I used this information for my "maynard" 
bytecode assembler / disassembler.

That said, I'm not sure who needs these super-fancy versions Serhiy is 
proposing.  To calculate stack depth, all you really need is the *maximum* 
stack depth per instruction.  You might slightly over-allocate but it shouldn't 
really be much of a problem.

Serhiy: what's your use case for all these complicated new features?

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<https://bugs.python.org/issue32455>
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