[issue25573] FrameSummary repr() does not support previously working uses of repr in traceback module

[Robert Collins]

Robert Collins added the comment:

So I think its fine to have a __len__ reporting 4. tuple(..) works via the iter() call, but thats really just a thunk to keep existing code working, and so __len__ for the same reason makes sense.

On the documentation issue, yes, updating the docs is appropriate.

Having the repr produce all the elements would be ok, the reason it is lazy is to avoid high costs for transient FrameSummary when its created and discarded shortly after.

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<http://bugs.python.org/issue25573>
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