python - how to use the post_mortem method of pdb? -


i trying understand how use pdb.post_mortem() method.

for given file

# expdb.py import pdb import trace  def hello():   = 6 * 9   b = 7 ** 2   c = * b   d = 4 / 0   print(c)  tracer = trace.trace()

command prompt

''' # first try  λ python -i expdb.py >>> pdb.post_mortem() traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "c:\program files\anaconda3\lib\pdb.py", line 1590, in post_mortem     raise valueerror("a valid traceback must passed if no " valueerror: valid traceback must passed if no exception being handled '''  ''' # second try  λ python -i expdb.py >>> pdb.post_mortem(traceback=tracer.run('hello()') )  --- modulename: trace, funcname: _unsettrace trace.py(77):         sys.settrace(none) traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "c:\program files\anaconda3\lib\trace.py", line 500, in run     self.runctx(cmd, dict, dict)   file "c:\program files\anaconda3\lib\trace.py", line 508, in runctx     exec(cmd, globals, locals)   file "<string>", line 1, in <module>   file "expdb.py", line 8, in hello     d = 4 / 0 zerodivisionerror: division 0 >>>

the post_mortem method wants traceback object, not trace object. traceback objects can acquired sys.exec_info()[2] inside of except block, or can call pdb.post_mortem() no arguments directly (in except block).

but either way, must catch exception before can debug it.


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