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Write a program that will prompt the user for a username and validate that username is in the approvedUsers dictionary before prompting for the password. # approvedUsers = {"user1": "paswd", "user2":"paswd2", “user3": "paswd3", “user4":"paswd4"} # Hint: multinle function should be used

Write a program that will prompt the user for a username and validate that username is in the approvedUsers dictionary before prompting for the password. # approvedUsers = {"user1": "paswd", "user2":"paswd2", “user3": "paswd3", “user4":"paswd4"} # Hint: multinle function should be used

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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**Title: User Authentication Program Guide** **Introduction:** In this exercise, you will learn how to create a program that takes a username input from a user and verifies its presence in a predefined list of approved users. This process is crucial for authenticating users in many applications. --- **Task:** Write a program that will: 1. Prompt the user for a username. 2. Validate that the username is part of the `approvedUsers` dictionary. 3. Only after validation, prompt the user to enter their password. **Predefined Data Structure:** ```python approvedUsers = { "user1": "paswd", "user2": "paswd2", "user3": "paswd3", "user4": "paswd4" } ``` **Hint:** - Utilize multiple functions to organize your code effectively. --- **Explanation:** When a user attempts to log in, the program should follow these steps: 1. **Input Prompt:** Ask the user for a username. 2. **Validation Check:** Ensure the entered username exists within the `approvedUsers` dictionary keys. - If the username exists, proceed to the password prompt. - If not, notify the user of an invalid username and allow retry. 3. **Optional:** Once the username is validated, the program could also check if the entered password matches the stored password. **Note:** This task emphasizes code structure and user input validation, forming a foundational step for secure application development. --- This exercise helps build fundamental skills in programming logic, data validation, and function usage, critical for software development.
Transcribed Image Text:**Title: User Authentication Program Guide** **Introduction:** In this exercise, you will learn how to create a program that takes a username input from a user and verifies its presence in a predefined list of approved users. This process is crucial for authenticating users in many applications. --- **Task:** Write a program that will: 1. Prompt the user for a username. 2. Validate that the username is part of the `approvedUsers` dictionary. 3. Only after validation, prompt the user to enter their password. **Predefined Data Structure:** ```python approvedUsers = { "user1": "paswd", "user2": "paswd2", "user3": "paswd3", "user4": "paswd4" } ``` **Hint:** - Utilize multiple functions to organize your code effectively. --- **Explanation:** When a user attempts to log in, the program should follow these steps: 1. **Input Prompt:** Ask the user for a username. 2. **Validation Check:** Ensure the entered username exists within the `approvedUsers` dictionary keys. - If the username exists, proceed to the password prompt. - If not, notify the user of an invalid username and allow retry. 3. **Optional:** Once the username is validated, the program could also check if the entered password matches the stored password. **Note:** This task emphasizes code structure and user input validation, forming a foundational step for secure application development. --- This exercise helps build fundamental skills in programming logic, data validation, and function usage, critical for software development.
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