Fix Python 2's traceback.format_exception, traceback.print_exception #1512
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E.g. it's legal to call traceback.format_exception(None, None, None). In particular, this change makes the following idiom type-check: import traceback import sys exc_type, exc_value, exc_traceback = sys.exc_info() traceback.format_exception(exc_type, exc_value, exc_traceback)
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E.g. it's legal to call
traceback.format_exception(None, None, None), in Python 2.In particular, this change makes the following idiom type-check:
(
sys.exc_info()returns Optional, for all three fields)