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d „ ƒ YZ d S( s’ Simple traceback introspection. Used to add additional information to
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D]C } | | j o | i d | ƒ n | i d | ƒ | d 7} q\Wn d i | ƒ S( sÞ Inspect a traceback and its frame, returning source for the expression
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Walk back from the err line up to 3 lines, but don't walk back over
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Walk forward up to 3 lines, counting \ separated lines as 1. Don't walk
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expands any that can be looked up in the frame.
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