Exception HANDLING

1. Exception Handling:
Mastering the Art of
Dealing with Errors
and Exceptions
Ramirez Carl
rcarl2229@gmail.com

2. Contents
1. Intro to Exception Handling
2. Common Built-In Exceptions
3. Try and Except Blocks
4. Else and Finally Blocks
5. Creating Custom Exceptions
6. Exception Handling Best Practices
7. Real World Example
8. Common Pitfalls
9. Debugging Exceptions
10. Context Managers
11. Basic syntax of try/except, else, finally
12. Creating custom exceptions
13. Best practices
14. A real world example
15. Debugging tools
16. Context managers

3. Intro to Exception Handling
Exception handling is a crucial part of software
development. This slide provides an introduction
to exception handling and its importance in
dealing with errors and exceptions. It covers the
basic concepts and strategies of handling
exceptions in various programming languages.

4. Common Built-In Exceptions
Understanding the common exceptions in programming
This section explains Exception 1 and
its common causes. It provides
examples and tips for handling this
specific exception effectively.
This section describes Exception 2
and its typical triggers in code. It
includes code snippets and best
practices for handling this built-in
exception.
Exception 1 Exception 2

5. Try and Except Blocks
Using try and except blocks for exception handling
This section explains the purpose and syntax of
the try block. It covers how to write code within
the try block to handle potential exceptions.
Try Block
1
This section discusses the except block and its
role in catching and handling exceptions. It
provides examples of different ways to handle
exceptions effectively.
Except Block
2
This section explores the concept of nested
try-except blocks and demonstrates how they
can be structured to handle multiple levels of
exceptions.
Nested Try-Except Blocks
3
This section covers the propagation of exceptions
and how they can be handled at different levels
of the program's execution.
Exception Propagation
4

6. Else and Finally Blocks
In addition to try and except blocks, the else and
finally blocks are essential components of
exception handling. This slide explains the
purpose and usage of these blocks in relation to
exception handling. It provides examples and best
practices for incorporating else and finally blocks
in exception handling code.

7. Creating Custom Exceptions
Creating and using custom exceptions in your code
This section guides you through the process of creating a custom exception class. It covers naming
conventions, inheritance, and best practices for implementing custom exceptions.
Custom Exception Class
1
This section demonstrates how to raise custom exceptions in your code. It includes explanations and
examples of when and how to use custom exceptions effectively.
Raising Custom Exceptions
2
This section discusses the methods for handling custom exceptions. It covers try-except blocks,
inheritance, and specific strategies for effectively handling custom exceptions.
Handling Custom Exceptions
3

8. Exception Handling Best Practices
Key practices for effective exception handling
This section emphasizes the importance of
handling specific exceptions and provides tips for
identifying and handling them correctly.
Handling Specific Exceptions
1
This section covers the importance of logging
and reporting exceptions. It includes
recommendations for logging frameworks, error
tracking systems, and best practices for error
reporting.
Logging and Reporting
Exceptions
2
This section focuses on creating user-friendly
and informative error messages. It provides
techniques for generating meaningful error
messages that help users understand and
resolve issues.
Graceful Error Messages
3
This section highlights the significance of
documenting exception handling practices. It
offers guidance on documenting code, error
messages, and handling procedures for better
team collaboration and code maintainability.
Documentation and Exception
Handling
4

9. Real World Example
Applying exception handling to a practical scenario
This section presents a
real-world scenario where
exception handling is
required. It provides an
overview of the scenario and
the potential exceptions that
can occur.
Scenario Overview
This section includes a code
example that demonstrates
how to handle exceptions in
the given scenario. It explains
the rationale behind the
chosen exception handling
approach.
Code Example
This section discusses the
importance of testing and
refining exception handling
code. It provides strategies
for testing different scenarios
and refining exception
handling mechanisms.
Testing and Refining

10. Common Pitfalls
This slide highlights common pitfalls and
mistakes in exception handling. It identifies the
areas where developers often make errors and
provides guidance on avoiding these pitfalls. It
covers topics such as improper exception
handling, excessive nesting, and overusing
generic exception handling.

11. Debugging Exceptions
Methods for debugging and troubleshooting exceptions
This section presents various techniques for
debugging exceptions. It covers tools, strategies, and
best practices for identifying and resolving exceptions
during development and testing.
Debugging Techniques
1
This section explains how logging and exception
analysis can aid in debugging exceptions. It provides
insights into analyzing log files and using exception
traceback information for efficient debugging.
Logging and Exception Analysis
2

12. Context Managers
Working with context managers for exception handling
This section provides an
overview of context
managers and their role in
exception handling. It
explains the contextlib
module and the 'with'
statement in Python.
Understanding Context
Managers
This section demonstrates
how to use context managers
for exception handling. It
includes examples and best
practices for utilizing context
managers in handling
resources and ensuring
proper cleanup.
Using Context Managers
This section covers creating
custom context managers. It
explains the implementation
of __enter__ and __exit__
methods, as well as best
practices for managing
resources and handling
exceptions in custom context
managers.
Custom Context
Managers

13. Basic syntax of try/except, else, finally
This slide provides an in-depth explanation of the
basic syntax of try/except, else, and finally blocks.
It covers the structure, order, and purpose of
these blocks in handling exceptions. It also
clarifies the scope and execution flow of each
block.

14. Creating custom exceptions
Step-by-step guide to creating custom exceptions
This section describes the steps involved in defining a
custom exception class. It covers naming
conventions, inheritance, and attributes for creating
effective custom exceptions.
Define Custom Exception Class
1
This section explains how to raise custom exceptions
in your code. It demonstrates the usage of the raise
keyword and provides examples of when and how to
raise custom exceptions effectively.
Raising Custom Exceptions
2

15. Best practices
Best practices for writing robust exception handling code
This section emphasizes the importance of
handling errors specific to your application. It
provides tips for identifying and handling
application-specific exceptions correctly.
Handling Errors Specific to
Your Application
1
This section explains the risks of using bare
except clauses and advocates for a more
specific exception handling approach. It includes
alternatives and best practices to handle
different exception types.
Avoiding Bare Except Clauses
2
This section focuses on creating user-friendly
and informative error messages. It provides
techniques for generating meaningful error
messages that help users understand and
resolve issues.
Graceful Error Messages
3
This section discusses the significance of testing
and fine-tuning exception handling code. It
provides strategies for testing different scenarios
and optimizing exception handling mechanisms.
Testing and Fine-Tuning
Exception Handling
4

16. A real world example
An example scenario demonstrating exception handling in action
This section presents a real-world scenario where
exception handling is required. It provides an overview
of the scenario and the potential exceptions that can
occur.
Scenario Overview
1
This section includes a code example that
demonstrates how to handle exceptions in the given
scenario. It explains the rationale behind the chosen
exception handling approach.
Code Example
2

17. Debugging tools
A toolkit for debugging and troubleshooting exceptions
This section introduces the Python Debugger
(PDB) and its features for debugging exceptions.
It covers basic commands, breakpoints, and
inspecting variables during debugging.
Python Debugger (PDB)
1
This section explains how to analyze exception
traceback information for effective debugging. It
includes tips for understanding and interpreting
exception tracebacks.
Exception Traceback
2
This section discusses how logging and exception
analysis can aid in debugging exceptions. It
provides insights into analyzing log files and
using exception traceback information for
efficient debugging.
Logging and Exception
Analysis
3
This section introduces various third-party
debugging tools for exception handling. It
includes popular tools and frameworks used for
debugging exceptions in different programming
languages.
Third-party Debugging Tools
4

18. Context managers
Advanced techniques for working with context managers