.. _module3_assignment:

Python Assignment Questions: Data Structures, Strings, Functions & Recursion
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**1. String Creation and Basic Operations**

   Write a program that creates different types of strings (single quotes, double quotes, triple quotes) and prints them.

   *Hint:* Use different quote types for string creation.

**2. String Indexing**

   Take a string as input and print the first, last, and middle characters.

   *Hint:* Use positive and negative indexing.

**3. String Slicing**

   Input a sentence and extract the first 5 characters, last 5 characters, and every second character.

   *Hint:* Use slicing with different parameters.

**4. String Immutability Demonstration**

   Show that strings are immutable by trying to change a character and then creating a new string.

   *Hint:* Attempt to modify a string character and handle the error.

**5. Uppercase and Lowercase**

   Take a string input and print it in both uppercase and lowercase.

   *Hint:* Use upper() and lower() methods.

**6. Find Substring**

   Input a main string and a substring, then find the position of the substring.

   *Hint:* Use find() method and handle the case when substring is not found.

**7. Replace Words**

   Take a sentence and replace all occurrences of "old" with "new".

   *Hint:* Use replace() method.

**8. Split and Join**

   Input a comma-separated string, split it into a list, then join it back with spaces.

   *Hint:* Use split() and join() methods.

**9. List Creation and Access**

   Create a list of 5 numbers, print the entire list, first element, and last element.

   *Hint:* Use square brackets for list creation and indexing.

**10. List Modification**

    Create a list, add an element, remove an element, and modify an existing element.

    *Hint:* Use append(), remove(), and indexing for modification.

**11. List Slicing**

    Create a list of 10 numbers and demonstrate different slicing operations.

    *Hint:* Use various slicing patterns like [2:5], [::2], [::-1].

**12. Dictionary Operations**

    Create a dictionary with student information, add a new key-value pair, and modify an existing value.

    *Hint:* Use dictionary literal syntax and key access.

**13. Dictionary Methods**

    Create a dictionary and demonstrate keys(), values(), and items() methods.

    *Hint:* Call these methods on the dictionary object.

**14. Set Operations**

    Create two sets and demonstrate union, intersection, and difference operations.

    *Hint:* Use |, &, and - operators or corresponding methods.

**15. Function Definition**

    Write a function that takes two numbers and returns their sum.

    *Hint:* Use def keyword, parameters, and return statement.

**16. Function with Default Parameters**

    Write a function that greets a person with a default greeting message.

    *Hint:* Use default parameter values in function definition.

**17. Recursion - Factorial**

    Write a recursive function to calculate factorial of a number.

    *Hint:* Base case: n == 0 or n == 1, recursive case: n * factorial(n-1).

**18. Recursion - Fibonacci**

    Write a recursive function to find the nth Fibonacci number.

    *Hint:* Base cases: n == 0 or n == 1, recursive case: fibonacci(n-1) + fibonacci(n-2).

**19. Lambda Function**

    Create a lambda function that squares a number and use it with map().

    *Hint:* Use lambda x: x**2 and map() function.

**20. Filter with Lambda**

    Use filter() with a lambda function to get even numbers from a list.

    *Hint:* Use lambda x: x % 2 == 0 with filter().