When I catch an exception how do I get the type file and line number

Question

Catching an exception that would print like this   Traceback  most recent call last     File  c  tmp py   line 1  in  lt module gt      4   0 ZeroDivisionError  integer division or modulo by zero   I want to format it into   ZeroDivisonError  tmp py  1

User · Answer

Simplest form that worked for me   import traceback  try      print 4 0  except ZeroDivisionError      print traceback format exc      Output  Traceback  most recent call last     File   path to file py   line 51  in  lt module gt      print 4 0  ZeroDivisionError  division by zero  Process finished with exit code 0

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Source  Py v2 7 3  for traceback format exception   and called related functions helps greatly   Embarrassingly  I always forget to Read the Source   I only did so for this after searching for similar details in vain  A simple question   How to recreate the same output as Python for an exception  with all the same details    This would get anybody 90   to whatever they re looking for   Frustrated  I came up with this example   I hope it helps others    It sure helped me    -   import sys  traceback  traceback template      Traceback  most recent call last     File    filename s   line   lineno s  in   name s   type s    message s n      Skipping the  actual line  item    Also note  we don t walk all the way through the frame stack in this example   see hg python org cpython file 8dffb76faacc Lib traceback py l280    Imagine if the 1 0  below  were replaced by a call to test   which did 1 0    try      1 0 except        http   docs python org 2 library sys html sys exc info     exc type  exc value  exc traceback   sys exc info     most recent  if any  by default              Reason this  can  be bad  If an  unhandled  exception happens AFTER this      or if we do not delete the labels on  not much  older versions of Py  the     reference we created can linger       traceback format exc print exc do this very thing  BUT note this creates a     temp scope within the function               traceback details                               filename   exc traceback tb frame f code co filename                            lineno     exc traceback tb lineno                            name       exc traceback tb frame f code co name                            type       exc type   name                              message    exc value message    or see traceback  some str                                  del exc type  exc value  exc traceback    So we don t leave our local labels objects dangling       This still isn t  completely safe   though         Best  recommended  practice  replace all exc type  exc value  exc traceback       with sys exc info   0   sys exc info   1   sys exc info   2       print     print traceback format exc       print     print traceback template   traceback details     print   In specific answer to this query   sys exc info   0    name    os path basename sys exc info   2  tb frame f code co filename   sys exc info   2  tb lineno

User · Answer

import sys  os  try      raise NotImplementedError  No error   except Exception as e      exc type  exc obj  exc tb   sys exc info       fname   os path split exc tb tb frame f code co filename  1      print exc type  fname  exc tb tb lineno

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You could achieve this without having to import traceback  try      func1   except Exception as ex      trace          tb   ex   traceback       while tb is not None          trace append                quot filename quot   tb tb frame f code co filename               quot name quot   tb tb frame f code co name               quot lineno quot   tb tb lineno                    tb   tb tb next     print str            type   type ex    name             message   str ex            trace   trace          Output        type    ZeroDivisionError      message    division by zero      trace                  filename     var playground main py          name     lt module gt           lineno   16                     filename     var playground main py          name    func1          lineno   11                     filename     var playground main py          name    func2          lineno   7                     filename     var playground my py          name    test          lineno   2

User · Answer

Without any imports  but also incompatible with imported modules  try      raise TypeError  quot Hello  World  quot      line 2 except Exception as e      print          type e    name               TypeError           file                        tmp example py         e   traceback   tb lineno    2          python3  tmp example py TypeError  tmp example py 2 To reiterate  this does not work across imports or modules  so if you do import X  try  X example    then the filename and line number will point to the line containing X example   instead of the line where it went wrong within X example    If anyone knows how to easily get the file name and line number from the last stack trace line  I expected something like e -1  filename  but no such luck   please improve this answer

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Here is an example of showing the line number of where exception takes place   import sys try      print 5 0  except Exception as e      print  Error on line     format sys exc info   -1  tb lineno   type e    name    e   print  And the rest of program continues

[python] When I catch an exception, how do I get the type, file, and line number?

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