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Suppose you have an exception object acquired from somewhere. The exception is no longer active on the stack. Now you want to format the exception like format_exception would (to log it, perhaps). To do this you apparently need to call:
 format_exception(type(exc), exc, exc.__traceback__)
This seems redundant, so it would be nice to have a simpler call. Too bad the name format_exception is already taken. But, leaving that aside, the above is not documented in the traceback module. The last example shows the (type(exc), exc) call form for format_exception_only, but that's as close as it gets.