Getting backtrace on an axception

[Paolo Pantaleo]

So I have this code

try:
do something
except:
do something else

In the except block I need to print detailed output about the error
occured, and in particular I need to read the backtrace for the line
that raised the exception [then modify and print it]. I know about the
exception.extract_tb() and friends, but I can't figure out how they
works.

Can somebody exlpain me?

Thnx
PAolo
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