_format_list(self, extracted_list)
Given a list of tuples as returned by extract_tb() or extract_stack(), return a list of strings ready for printing. Each string in the resulting list corresponds to the item with the same index in the argument list. Each string ends in a newline; the strings may contain internal newlines as well, for those items whose source text line is not None.
Lifted almost verbatim from traceback.py
Format a list of traceback entry tuples for printing.
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