How to resolve the algorithm Exceptions step by step in the Python programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Exceptions step by step in the Python programming language

Table of Contents

Problem Statement

This task is to give an example of an exception handling routine and to "throw" a new exception.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Exceptions step by step in the Python programming language

  1. The first statement of your code defines a custom exception called SillyError, which inherits from the built-in Exception class. The __init__() method takes a single argument, args, and stores it in the self.args instance variable.

  2. The second statement defines another custom exception called MyInvalidArgument, which inherits from the ValueError class. This class does not define any additional behavior beyond what is inherited from ValueError.

  3. The third statement defines a function called spam() that raises a SillyError exception without any arguments. This is equivalent to raising a SillyError() exception.

  4. The fourth statement defines a function called spam() that raises a SillyError exception with the argument 'egg'. This is equivalent to raising a SillyError('egg') exception.

  5. The fifth statement defines a function called spam() that raises a SillyError exception with the argument 'egg'. This is equivalent to raising a SillyError('egg') exception.

  6. The sixth statement defines a try/except block that attempts to call the foo() function. If the foo() function raises a SillyError exception, the exception will be caught and the print(se.args) statement will be executed, where se is the caught exception. The bar() function will then be called. If no exception is raised by the foo() function, the else block will be executed and the quux() function will be called. The finally block will always be executed, regardless of whether an exception was raised or not, and the baz() function will be called.

  7. The seventh statement defines a try/except block that attempts to call the foo() function. If the foo() function raises a SillyError exception, the exception will be caught and the print(se.args) statement will be executed, where se is the caught exception. The bar() function will then be called. If no exception is raised by the foo() function, the else block will be executed and the quux() function will be called. The finally block will always be executed, regardless of whether an exception was raised or not, and the baz() function will be called.

Source code in the python programming language

import exceptions
class SillyError(exceptions.Exception):
    def __init__(self,args=None):
         self.args=args

class MyInvalidArgument(ValueError):
   pass

def spam():
    raise SillyError # equivalent to raise SillyError()

def spam():
    raise SillyError, 'egg' # equivalent to raise SillyError('egg')

def spam():
    raise SillyError('egg')

try:
   foo()
except SillyError, se:
   print se.args
   bar()
else:
   # no exception occurred
   quux()
finally:
   baz()

try:
   foo()
except SillyError as se:
   print(se.args)
   bar()
else:
   # no exception occurred
   quux()
finally:
   baz()

  

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