Programming Concepts I: Errors and Exceptions
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Questions and Answers

What happens when an exception is raised inside the test_function when the input parameter is 12?

  • The program continues to the next line after the exception.
  • The execution is interrupted and nothing after the exception is executed. (correct)
  • The always printed message in the finally block will still execute. (correct)
  • The exception is caught only if it's during the try block before the function call.

What is the correct order of execution when an exception is raised in the test_function?

  • Finally block executes before any except handling.
  • start function -> except block -> try block
  • try block -> finally block -> except block
  • try block -> except block -> finally block (correct)

What is the purpose of the finally block in the given code?

  • To skip the execution of the code if an exception occurs.
  • To handle the exception and log an error.
  • To ensure that certain code executes no matter what. (correct)
  • To provide an additional layer of exception handling.

Which of the following is considered a best practice for error handling with exceptions in Python?

<p>Always include a finally block for resource cleanup. (D)</p> Signup and view all the answers

Which exception type is generally raised when an invalid argument is passed to a function in Python?

<p>TypeError (A), ValueError (C)</p> Signup and view all the answers

What is the purpose of using a try-except block in Python?

<p>To handle potential errors without disrupting the program. (B)</p> Signup and view all the answers

Which of the following exceptions would be specifically caught by Python's ValueError?

<p>A user inputs a string when an integer is expected. (B)</p> Signup and view all the answers

What happens to the execution flow when an exception is raised in the try block?

<p>Execution jumps to the corresponding except block. (C)</p> Signup and view all the answers

What does the finally block do in a try-except structure?

<p>It always executes regardless of whether an exception occurred. (A)</p> Signup and view all the answers

Which of the following is a best practice for error handling in Python?

<p>Handling specific exceptions where possible. (A)</p> Signup and view all the answers

Which of the following exceptions is raised when trying to access an invalid index in a list?

<p>IndexError (B)</p> Signup and view all the answers

What is the consequence of not handling exceptions properly in a program?

<p>The program may terminate unexpectedly. (A)</p> Signup and view all the answers

Which exception is raised when a division by zero occurs in Python?

<p>ZeroDivisionError (B)</p> Signup and view all the answers

In which scenario would you prefer to use a specific exception instead of a generic Exception?

<p>When you need to take action based on the type of error. (B)</p> Signup and view all the answers

How can exceptions be raised deliberately in Python?

<p>Using the raise keyword. (A)</p> Signup and view all the answers

What happens if the ZeroDivisionError exception block is placed last in the order of exception blocks?

<p>It will not catch the ZeroDivisionError exception. (A), It will only execute if there are no prior matches. (B)</p> Signup and view all the answers

In the context of exception handling, when should the Exception block be placed?

<p>After all specific exception blocks. (D)</p> Signup and view all the answers

What is the purpose of the finally block in a try-except structure?

<p>To execute clean-up code that runs regardless of exceptions. (C)</p> Signup and view all the answers

How can you manually trigger an exception in Python?

<p>Using the raise keyword. (B)</p> Signup and view all the answers

What type of exception will be raised if an age below 16 is inputted?

<p>ValueError (D)</p> Signup and view all the answers

What is a key characteristic of the Exception block?

<p>It captures every possible exception that can occur. (A)</p> Signup and view all the answers

In raising an exception manually, what must you provide?

<p>An associated error message and error type. (D)</p> Signup and view all the answers

What will happen if the return statement inside a try block is executed?

<p>The finally block will still execute. (A)</p> Signup and view all the answers

What is the outcome of an unsupported operation in the try block?

<p>A TypeError will be raised and caught by the except block. (B)</p> Signup and view all the answers

What can be done within the raise statement when defining a specific error?

<p>Add a custom message to the exception. (C)</p> Signup and view all the answers

What output is expected when a valid input is entered in the age example?

<p>'Welcome member.' (C)</p> Signup and view all the answers

In the example where coin toss is evaluated, what happens when an invalid option is chosen?

<p>An exception will be raised with a message to try again. (B)</p> Signup and view all the answers

Flashcards

Errors in Programming

Problems that can occur during a program's execution.

Exceptions

Specific types of errors that interrupt program flow, typically during runtime.

try-except Block

A code structure to handle exceptions, allowing the program to continue despite errors.

except block

A block of code executed if a specific exception occurs within the try block.

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finally block

A block of code that always executes, regardless of whether an exception occurred or not.

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Raising Exceptions

Deliberately generating an exception within a program.

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Exceptions Across Functions

How an exception in one function can affect other parts of a program.

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ValueError

Python exception raised when a function receives an argument of an inappropriate type.

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TypeError

Python exception raised when a function receives an incorrect data type.

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ZeroDivisionError

Python exception raised when a division by zero is attempted.

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Exception Handling

A mechanism in programming to deal with errors or unexpected situations.

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Exception in Function

An error raised within a function which stops the function execution, and may trigger a different block of code to get executed.

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Exception Propagation

The process of an exception being thrown from one function and handled by a higher-level program block or function if an exception occurs within a function, it might "bubble up" to a caller function.

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Specific Exceptions

Using distinct except blocks for different exception types, allowing the program to handle specific errors.

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Order of Exceptions

The order of except blocks matters. Python checks from top to bottom, executing the first matching block. Specific exceptions should come before a general Exception block.

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General Exception

A broad except block that catches any exception not caught by specific blocks. It acts as a safety net for unexpected errors.

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What does finally do?

The finally block ensures that a specific block of code always executes, whether an exception occurred within the try block or not.

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Why use finally?

Used for releasing resources (like closing files or connections), ensuring tasks are completed even if errors occur.

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Raising an Exception

Triggering an exception manually using the raise keyword to signal an error condition.

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What is a raise statement for?

To signal an error condition within your program, giving more control over error handling.

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What is a ValueError?

An exception raised when a function receives an argument of an incorrect type or value.

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What is a TypeError?

An exception raised when you attempt an operation with an invalid type.

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What is a ZeroDivisionError?

An exception raised when you try to divide by zero, which is mathematically impossible.

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How do exceptions behave across functions?

Exceptions can propagate across functions, affecting other parts of your program. Think of a chain reaction!

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How to handle exceptions in a function?

Exceptions raised within a function can be handled by try and except blocks in the calling function.

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Study Notes

Programming Concepts I: Errors and Exceptions

  • Errors can occur at any point during a program's execution.
  • Anticipating all potential errors is impossible.
  • User input and interactions with other software/hardware can lead to unexpected errors.
  • Errors can arise from various sources, including code defects or external factors.

Exceptions

  • Exceptions are specific types of errors that halt program execution.
  • Modern programming languages (like Python) have exception handling mechanisms.
  • An exception occurs when a program tries to perform an operation that it cannot handle. For example, trying to divide by zero.
  • Handling exceptions keeps the program from crashing.

Try-except Block

  • The try block contains the code that might raise an exception.
  • except blocks handle specific types of exceptions.
  • If no exception occurs in the try block, the except blocks are ignored.
  • If an exception occurs in the try block, execution immediately jumps to the matching except block and stops executing in the try block.
  • You can optionally assign the exception to a variable for more information on the exception

Try-except Example

  • A try...except block is used to handle potential exceptions during the execution of a piece of code.
  • The code within the try block is executed.
  • If an exception occurs, the code in the matching except block executes.
  • This prevents the program from crashing, due to errors that might be caused by issues with user input.

Specific Exceptions

  • Python allows you to catch specific types of exceptions.
  • This allows you to provide more tailored error handling.
  • Examples include ValueError, TypeError, ZeroDivisionError and IndexError.

Exception Order

  • Python checks except blocks in order.
  • A generic except block is used to catch exceptions that you haven't anticipated.
  • The most specific exception should come first.

Finally Block

  • The finally block is used to execute code regardless of whether an exception occurs within the try block.
  • This is essential for tasks like releasing resources (e.g., closing files).

Raising Exceptions

  • You can explicitly raise an exception using the raise keyword.
  • This is often used to enforce specific conditions (e.g., input validation).
  • A message can be included with the exception for more informative error messages

Exceptions Across Functions

  • An exception raised within a function can cause the program to stop running.
  • This means the program will always execute the finally clause within the main block.

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PROG1925 Programming Concepts I - Errors and Exceptions PDF

Description

This quiz covers the fundamentals of errors and exceptions in programming, focusing on how they can occur during execution and the importance of exception handling. Understand the concepts of try-except blocks and how they prevent program crashes when unexpected conditions arise.

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