如何在Python中打印异常对象的堆栈跟踪？

Question

How to print the stack trace of an exception object in Python?

Note that the question is NOT about printing stack trace of LAST exception. Exception object may be saved at some distant point of time in the past.

Answer 1

It's a bit inconvenient, but you can use traceback.print_exception . Given an exception ex :

traceback.print_exception(type(ex), ex, ex.__traceback__)

Example:

import traceback

try:
    1/0
except Exception as ex:
    traceback.print_exception(type(ex), ex, ex.__traceback__)

# output:
# Traceback (most recent call last):
#   File "untitled.py", line 4, in <module>
#     1/0
# ZeroDivisionError: division by zero

Answer 2

you can manually iterate through the __traceback__ attribute to print lines & files:

def function():
    raise ValueError("flfkl")

try:
    function()
except Exception as e:
    traceback = e.__traceback__
    while traceback:
        print("{}: {}".format(traceback.tb_frame.f_code.co_filename,traceback.tb_lineno))
        traceback = traceback.tb_next