Program Explanation Exception Handler: The purpose of “exception handler” is to handle the errors that occur in the “try” suite. “try” suite: The “try” suite starts with the keyword “try”, and it is placed in the code that has the possibility to generate an exception. • The exception is caught in the “try” suite. • If an error is recognized in the “try” suite, immediately the execution of the program is stopped. • In Python, the “try” suite is represented with the keyword “try”, followed by the colon. “except” clause: • In Python, the “except” clause starts with the keyword “except”, followed by “Exception_Name”. • The exceptions raised in the “try” suite are handled in the “except” clause. • In a program, the “except” clause is used after the “try” suite. “else “suite: • The block of code that belongs to the “else” suite will appear inside the “else” clause. • It is optional to have the “else” clause in the program that contains the “try/except” statements. • The “else” clause appears after the “except” clause. • If no exception is raised in the “try” suite statement, then the “else” suite statement is executed. • The “else” clause is skipped when an exception occurs in the “try” suite. Syntax: The following syntax demonstrates the “else” clause in the “try/except” statement: try: # Program with Exception except Exception Name: # Program that handles Exception else: # Statement Example program using the “else” suite: The following program is used to demonstrate the “else” suite: #Function main def main(): #Initialize a value to the variable result=0.0 #Try block try: #Opens the file inputfile = open('sales_data...

4th Edition

ISBN: 9780134444321

Author: Tony Gaddis

Publisher: PEARSON

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Exception Handling Keywords

An exception is a situation or anomaly that occurs during the program execution which prevents the execution from continuing further. An exception is an unexpected behavior that can cause the program to stop abruptly.

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Chapter 6, Problem 8TF

Program Plan Intro

Exception:

• An exception is an error that occurs during a program execution.

• The program execution stops abruptly when an exception occurs in the program.

• To handle exceptions in the Python programs, the “try/except” statements are used.

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Chapter 6, Problem 7TF

Chapter 6, Problem 9TF

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Chapter 6 Solutions

Starting Out with Python (4th Edition)

Ch. 6.1 - What is an output file?Ch. 6.1 - What is an input file?Ch. 6.1 - What three steps must be taken by a program when...Ch. 6.1 - Prob. 4CP Ch. 6.1 - Prob. 5CP Ch. 6.1 - When writing a program that performs an operation...Ch. 6.1 - If a file already exists, what happens to it if...Ch. 6.1 - What is the purpose of opening a file?Ch. 6.1 - What is the purpose of closing a file?Ch. 6.1 - Prob. 10CP

Ch. 6.1 - In what mode do you open a file if you want to...Ch. 6.2 - Write a short program that uses a for loop to...Ch. 6.2 - Prob. 13CP Ch. 6.2 - Assume the file data.txt exists and contains...Ch. 6.2 - Prob. 15CP Ch. 6.3 - Prob. 16CP Ch. 6.3 - Prob. 17CP Ch. 6.3 - Prob. 18CP Ch. 6.4 - Prob. 19CP Ch. 6.4 - Prob. 20CP Ch. 6.4 - What type of exception does a program raise when...Ch. 6.4 - Prob. 22CP Ch. 6 - A file that data is written to is known as...Ch. 6 - A file that data is written to is known as...Ch. 6 - Before a file can be used by a program, it must be...Ch. 6 - When a program is finished using a file, it should...Ch. 6 - The contents of this type of file can be viewed in...Ch. 6 - This type of file contains data that has not been...Ch. 6 - When working with this type of file, you access...Ch. 6 - When working with this type of file, you can jump...Ch. 6 - This is a small holding section" in memory that...Ch. 6 - This marks the location of the next item that will...Ch. 6 - When a file is opened in this mode, data will be...Ch. 6 - This is a single piece of data within a record. a....Ch. 6 - Prob. 13MC Ch. 6 - Prob. 14MC Ch. 6 - Prob. 15MC Ch. 6 - When working with a sequential access file, you...Ch. 6 - When you open a file that file already exists on...Ch. 6 - The process of opening a file is only necessary...Ch. 6 - Prob. 4TF Ch. 6 - When a file that already exists is opened in...Ch. 6 - Prob. 6TF Ch. 6 - You can have more than one except clause in a...Ch. 6 - Prob. 8TF Ch. 6 - Prob. 9TF Ch. 6 - Describe the three steps that must be taken when a...Ch. 6 - Why should a program close a file when it's...Ch. 6 - What is a read position? where is the read...Ch. 6 - If an existing file is opened in append mode, What...Ch. 6 - If a file does not exist and a program attempts to...Ch. 6 - Write a program that opens an output file with the...Ch. 6 - Write a program that opens the my_name.txt file...Ch. 6 - Write code that does the following: opens an...Ch. 6 - Prob. 4AW Ch. 6 - Modify the code that you wrote in problem 4 so it...Ch. 6 - Write code that opens an output file with the...Ch. 6 - A file exists on the disk named students. txt. The...Ch. 6 - A file exists on the disk named students txt. The...Ch. 6 - Prob. 9AW Ch. 6 - Prob. 10AW Ch. 6 - File Display Assume a file containing a series of...Ch. 6 - File Head Display Write a program that asks the...Ch. 6 - Line Numbers Write a program that asks the user...Ch. 6 - Item Counter Assume a file containing a series of...Ch. 6 - Sum of Numbers Assume a file containing a series...Ch. 6 - Average of Numbers Assume a file containing a...Ch. 6 - Random Number File Writer Write a program that...Ch. 6 - Random Number File Reader This exercise assumes...Ch. 6 - Prob. 9PE Ch. 6 - Golf Scores The Springfork Amateur Golf Club has a...Ch. 6 - Personal Web Page Generator Write a program that...Ch. 6 - Average Steps Taken A Personal Fitness Tracker is...

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Exception: • An exception is an error that occurs during a program execution. • The program execution stops abruptly when an exception occurs in the program. • To handle exceptions in the Python programs, the “try/except” statements are used.

Solution Summary: The author explains the purpose of "exception handler" to handle exceptions in Python programs.

Concept explainers

Exception: • An exception is an error that occurs during a program execution. • The program execution stops abruptly when an exception occurs in the program. • To handle exceptions in the Python programs, the “try/except” statements are used.

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Chapter 6 Solutions

Exception:

• An exception is an error that occurs during a program execution.

• The program execution stops abruptly when an exception occurs in the program.

• To handle exceptions in the Python programs, the “try/except” statements are used.