About catching ANY exception

Question

How can I write a try except block that catches all exceptions

User · Answer

To catch all possible exceptions  catch BaseException  It s on top of the Exception hierarchy  Python 3  https   docs python org 3 9 library exceptions html exception-hierarchy Python 2 7  https   docs python org 2 7 library exceptions html exception-hierarchy try      something   except BaseException as error      print  An exception occurred      format error    But as other people mentioned  you would usually not need this  only for specific cases

User · Answer

You can do this to handle general exceptions  try      a   2 0 except Exception as e      print e   doc       print e message

User · Answer

There are multiple ways to do this in particular with Python 3 0 and above  Approach 1   This is simple approach but not recommended because you would not know exactly which line of code is actually throwing the exception   def bad method        try          sqrt   0  -1     except Exception as e          print e   bad method     Approach 2  This approach is recommended because it provides more detail about each exception  It includes    Line number for your code File name The actual error in more verbose way   The only drawback is tracback needs to be imported   import traceback  def bad method        try          sqrt   0  -1     except Exception          print traceback print exc     bad method

User · Answer

You can but you probably shouldn t   try      do something   except      print  Caught it     However  this will also catch exceptions like KeyboardInterrupt and you usually don t want that  do you  Unless you re-raise the exception right away - see the following example from the docs   try      f   open  myfile txt       s   f readline       i   int s strip    except IOError as  errno  strerror       print  I O error  0     1   format errno  strerror  except ValueError      print  Could not convert data to an integer   except      print  Unexpected error    sys exc info   0      raise

User · Answer

Very simple example  similar to the one found here   http   docs python org tutorial errors html defining-clean-up-actions  If you re attempting to catch ALL exceptions  then put all your code within the  try   statement  in place of  print  Performing an action which may throw an exception      try      print  Performing an action which may throw an exception   except Exception  error      print  An exception was thrown       print str error  else      print  Everything looks great   finally      print  Finally is called directly after executing the try statement whether an exception is thrown or not     In the above example  you d see output in this order   1  Performing an action which may throw an exception   2  Finally is called directly after executing the try statement whether an exception is thrown or not   3   An exception was thrown   or  Everything looks great   depending on whether an exception was thrown   Hope this helps

User · Answer

I ve just found out this little trick for testing if exception names in Python 2 7   Sometimes i have handled specific exceptions in the code  so i needed a test to see if that name is within a list of handled exceptions   try      raise IndexError  as test error except Exception as e      excepName   type e    name     returns the name of the exception

User · Answer

try      whatever   except        this will catch any exception or error   It is worth mentioning this is not proper Python coding  This will catch also many errors you might not want to catch

User · Answer

Apart from a bare except  clause  which as others have said you shouldn t use   you can simply catch Exception   import traceback import logging  try      whatever   except Exception as e      logging error traceback format exc          Logs the error appropriately     You would normally only ever consider doing this at the outermost level of your code if for example you wanted to handle any otherwise uncaught exceptions before terminating   The advantage of except Exception over the bare except is that there are a few exceptions that it wont catch  most obviously KeyboardInterrupt and SystemExit  if you caught and swallowed those then you could make it hard for anyone to exit your script

[python] About catching ANY exception

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