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assume s is a string of numbers. Write a program that prints the longest substring of s in which the numbers occur in ascending order and compute the average of the numbers found. For example, if s = '', then your program should print Longest substring in numeric ascending order is: 14578 Average: 5 In the case of ties, print the first substring. For example, if s = '147279', then your program should print Longest substring in numeric descending order is: 147 Average: 4

Write a python program that prompts the user for the names of two text files and compare the contents of the two files to see if they are the same. If they are, the scripts should simply output “Yes”. If they are not, the program should output “No”, followed by the first lines of each file that differ from each other. The input loop should read and compare lines from each file. The loop should break as soon as a pair of different lines is found. Note: Input file will be given by me. First file name: Master.txt Second file name: Slave.txt

Develop a python program that will determine if a department store customer has exceeded the credit limit on a charge account. For each customer, the following facts are available: Account number, Balance at the beginning of the month, Total of all items charged by this customer this month, Total of all credits applied to this customer’s account this month, Allowed credit limit. The program should input each of the facts, calculate the new balance (=beginning balance + charges – credits), and determine if the new balance exceeds the customer’s credit limit. For those customers whose credit limit is exceeded, the program should display the customer’s account number, credit limit, new balance, and the message “Credit limit exceeded”. The program should continue until the user enters -1 as the account number.

Write a program that encrypts and decrypts the user input. Note – Your input should be only lowercase characters with no spaces. Your program should have a secret distance given by the user that will be used for encryption/decryption. Each character of the user’s input should be offset by the distance value given by the user. For Encryption Process: Take the string and reverse it. Encrypt the reverse string with each character replaced with distance value (x) given by the user. For Decryption: Take the string and reverse it. Decrypt the reverse string with each character replaced with distance value (x) given by the user. The program should ask the user for input to encrypt, and then display the resulting encrypted output. Next, it should ask for input to decrypt, and then display the decrypted output.

Write a program that will analyze a string input and print “accept” or “reject” based on the pattern given. Accept if it fulfills the following conditions: string length 9, 3 lowercase alphabets, 3 digits, 3 uppercase alphabets, first alphabet uppercase, last character a number, and no two consecutive lowercase alphabets. Reject if any condition is absent.

Paper For Above instruction

This assignment encompasses multiple programming tasks that demonstrate fundamental Python programming skills, including string manipulation, file handling, conditional logic, and simple encryption algorithms. Each problem requires understanding specific concepts and applying them correctly to produce the desired outputs, emphasizing clarity, commentation, and adherence to class-taught commands.

Problem 1: Longest Ascending Substring and Average Calculation

The first problem involves analyzing a string of numbers to identify the longest substring where digits are in ascending order. After finding this substring, the program computes the average of its digits. The approach involves iterating through the string, tracking current ascending sequences, and updating the maximum as needed. Once identified, the program outputs the substring and its average. Handling ties by selecting the first occurrence is crucial, hence the program should only update the maximum when a longer sequence is found.

For example, for s = "145789", the output should be:

Longitudinal substring in numeric ascending order is: 14578 Average: 5

An additional example with descending order: s = "147279" results in:

Longest substring in numeric descending order is: 147 Average: 4

This problem requires basic string traversal and comparison, all achievable with simple loops and without invoking functions not covered in class.

Problem 2: Comparing Two Text Files

The second task prompts the user to input filenames of two text files. The program then reads both files line by line, comparing each line. If the content matches throughout, the output is "Yes". If a difference is detected, the program stops comparison immediately and prints "No" along with the first differing lines from each file.

Handling file I/O and line-by-line comparison can be achieved with open(), readline(), and simple conditional statements. The program breaks the loop upon the first discrepancy detected, optimizing performance by avoiding unnecessary comparison after inequality is found.

Sample input filenames are "Master.txt" and "Slave.txt" as specified, but the script can handle arbitrary filenames provided by the user. Proper exception handling is recommended to manage file access errors.

Problem 3: Credit Limit Exceedance Check

The third task simulates a bank or store credit account management system. The program repeatedly prompts for customer data, including account number, starting balance, total charges, total credits, and credit limit. Using these inputs, it calculates the new balance and evaluates if it exceeds the credit limit. If so, it outputs relevant details and the warning message. The loop continues until the user inputs -1 for the account number, signaling termination.

This process involves straightforward arithmetic and conditional checks, making it suitable for practicing basic input, computation, and output formatting. Ensuring numeric conversions and proper input prompts is essential for accurate calculations.

Problem 4: String Encryption and Decryption

This problem introduces simple symmetric encryption based on string reversal and character offsetting. The user inputs a lowercase string without spaces; the program reverses this string, then shifts each character by a secret distance to produce an encrypted output. For decryption, the process is reversed: take the encrypted string, reverse it, and shift characters back by the same distance to recover the original string.

Implementation involves character manipulation using ASCII values or Python's ord() and chr() functions, applying the offset, and ensuring the reversal order. Proper input handling for both encryption and decryption phases, along with displaying results, completes this task.

Problem 5: String Pattern Validation

The final problem requires analyzing a string against a set of specific conditions for acceptance or rejection. The string must be exactly nine characters long, begin with an uppercase letter, end with a digit, contain exactly three lowercase letters and three uppercase letters, and three digits. Additionally, two consecutive lowercase letters are not permitted.

The implementation involves validating each condition systematically, utilizing string indexing, and counters for character types. Early rejection upon failing a condition optimizes performance. Proper parsing and counting strategies support clear validation logic.

The program outputs "accept" if all conditions are met; otherwise, "reject."

Conclusion

This assignment provides an extensive exercise in Python programming, emphasizing string processing, file I/O, control structures, and simple algorithms. Adhering strictly to class-instructed commands and avoiding advanced or unrelated functions ensures focused learning. Clear commenting and code readability are integral along with correct implementation of algorithmic logic to meet the specified requirements.

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