[Python] Pdb go to a frame in exception within exception

I am debugging a program named a.py using pdb

def f(x) :
x / x

def g(x) :
try :
f(x)
except Exception as e :
assert 0

g(0)


When I run the program using python3 -m pdb a.py, the program stops at assert 0 line, and I get the following error information:

Traceback (most recent call last):
File "/tmp/a.py", line 6, in g
f(x)
File "/tmp/a.py", line 2, in f
x / x
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib64/python3.6/pdb.py", line 1667, in main
pdb._runscript(mainpyfile)
File "/usr/lib64/python3.6/pdb.py", line 1548, in _runscript
self.run(statement)
File "/usr/lib64/python3.6/bdb.py", line 434, in run
exec(cmd, globals, locals)
File "<string>", line 1, in <module>
File "/tmp/a.py", line 11, in <module>
g(0)
File "/tmp/a.py", line 9, in g
assert 0
AssertionError


and the stack is (shown using bt command):

(Pdb) bt
/usr/lib64/python3.6/pdb.py(1667)main()
-> pdb._runscript(mainpyfile)
/usr/lib64/python3.6/pdb.py(1548)_runscript()
-> self.run(statement)
/usr/lib64/python3.6/bdb.py(434)run()
-> exec(cmd, globals, locals)
<string>(1)<module>()->None
/tmp/a.py(11)<module>()->None
-> g(0)
> /tmp/a.py(9)g()
-> assert 0
(Pdb)


The problem is, I cannot go to function f to debug x / x simply using up and down, because my stack ends at the g function.

How should I debug such exceptions within exceptions? What about exceptions within exceptions within exceptions ...?

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