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How to Code Custom Exception Handling in Python ?


In this post , we will see How to Code Custom Exception Handling in Python . Apart from the regular , out of the box or in-built exceptions, Python facilitates us to create or define our our own custom Exceptions as per the Business need.

(Meanwhile if you haven't read our detailed post on Various ways of Exception Handling in Python , Read it How to Handle Errors and Exceptions in Python ? ) An User can create or define their Own Exceptions , based on Specific Business Logic . You can create a Custom Exception if -

  • The existing In-Bulit Python Exceptions doesn't cover the requirement OR,
  • You wish to integrate some more sophisticated logging system or further inspect an object OR,
  • You wish to show more Specific information when the exception or error occurs OR,
  • You may need a tailor-made exception for specific database or a service work etc.
  Let's see how we can do Custom Exception handling various ways -

Custom Exception 1 - Traceback :

When any Exception is raised and but is not handled , then it will just print a traceback to the error output. In such a case , the error output is just the Python console. A trace back message gives just some information and some details about the actual error that occurred .



try: 
    your\_function() 

except: 
    import traceback 
    s = traceback.format\_exc() 
    some\_function\_to\_use\_traceback\_details(s) 
    raise

Custom Exception 2 - Vanilla Exception :

We can create an object from the the Python Exception . And then raise the error ourselves. This is the most plain vanilla use of it. 



def card\_type(card): 
    
 if card == "xxxx": 
 raise Exception("xxxx types of Card is not accepted") 
 print "Card Accepted")

Custom Exception 3 - Exception Sub classes :

If we would like to make the Exception more meaningful and custom tailor made , we can create Exception Subclass. See the examples below -

Example-1



class CustomException(Exception): 

  def \_\_init\_\_\_(self,customArgs): 
    Exception.\_\_init\_\_(self,"Custom Exception raised with parameters {0}".format(customArgs)) 
    self.customArgs = customArgs


def do\_something(arg1,arg2): 

  if validity\_ok(arg1,arg2) : 
    all\_good()
  else: 
    raise CustomException({'arg1' : arg1, 'arg2' : arg2})
Example-2



<import\_Statements\>

import os

import errno

class <Custom\_Exception\_Name\>(Exception):  

 """
   Exception raised for errors Custom case.

 Attributes: 
   message -- explain about the error

 """  

 def \_\_init\_\_(self, message):  
 
 # Calling the Base class constructor with the parameters 
 super().\_\_init\_\_(message)  

 def <Custom\_Function\> ()  

 if <CHECK\_IF\_BUSINESS\_CRITERIA\_is\_MET\>

 <NO\_NEED\_TO\_DO\_ANYTHING\>

 else: \##### DEFINE THE EXCEPTION DETAILS HERE

 raise <Custom\_Exception\_Name\>(errno.ENOENT, os.strerror(errno.ENOENT))  



Custom\_Function()
   

Custom Exception 4 - Customise the Standard Errors:

We can use an existing Standard Built-in Python exception class and then create a new instance of that class. This way we can enhance and build upon the functionality provided by the Existing Built-in Python exception. See the example below -  



class CustomException(ValueError):
 def \_\_init\_\_(self, arg):
  self.strerror \= arg
  self.args \= {arg}
 try:
 raise CustomException("Age must be more than 18")
 except CustomException as e:
 print("This is Custom ValueError Exception - ", e.strerror)
If you want to read more about Python Exception Handling , read our Earlier Post - How to Handle Errors and Exceptions in Python ?  

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