PYTHON REVISION TOUR – I VIVA

1. What is a character set in Python?

Ans :- The set of valid characters that Python recognizes for writing programs, including letters, digits, and symbols.

2. List some commonly used characters in Python.

Ans :- Letters (a-z, A-Z), digits (0-9), special symbols (+, -, *, /), and whitespace characters (space, tab, newline).

3.Is Python case-sensitive?  

Ans :-  Yes, Python distinguishes between uppercase and lowercase letters.

4. What is the use of whitespace in Python?**  

Ans :- Whitespace is used for indentation and separating tokens.

5. What are tokens in Python? 

Ans :- Tokens are the smallest units of a program, such as keywords, identifiers, literals, operators, and punctuators.

6.What are Python keywords?  

Ans :- Reserved words in Python with special meanings (e.g., `if`, `else`, ‘while’, ‘for’, etc.).

7. What is an identifier?

Ans :- A name used to identify variables, functions, or classes.

8. What are literals in Python?  

Ans :- Fixed values in a program, such as numbers (`123`), strings (`”Hello”`), or booleans (`True`, `False`).

9.What are operators?

Ans :- Symbols used to perform operations (e.g., `+`, `-`, `*`, `/`, `==`).

10. What are punctuators in Python? 

Ans :- Symbols like `,`, `:`, `[]`, `{}`, used to structure code.

11. What are the components of a basic Python program?  

Ans :- Comments, statements, functions, and blocks.

12. What is the significance of indentation in Python? 

Ans :- Indentation defines the block of code and is mandatory for structuring.

13. How do you write comments in Python?

Ans Single-line comments use `#`. Multi-line comments use triple quotes (`”””` or `”’`).

14. What is the main function in Python? 

Ans :- It’s the entry point for execution, written as:  

      if __name__ == “__main__”:

main()

 15. What is a variable in Python? 

Ans :- A name that refers to a value stored in memory.

16. How do you assign a value to a variable?  

Ans :- Using the assignment operator `=`.   x = 10

17. What are dynamic variables? 

Ans :- Variables that can change their type during runtime in Python.

18. Can variable names start with a number? 

Ans :- No, variable names must start with a letter or underscore.

19. What is multiple assignment?

Ans :- Assigning multiple variables in a single line.   a, b, c = 1, 2, 3

20. How do you take input from the user in Python?

Ans :- input_value = input(“Enter something: “)

21. What is the default type of `input()`?  

Ans :- String.

22. How do you print output in Python?**  

Ans :- print(“Hello, World!”)

23. How can you format strings in `print()`?  

Ans :- Using `f-strings` or `.format()`.  

print(f”My name is {name}”)

24. What are Python’s basic data types?  

Ans :- `int`, `float`, `str`, `bool`, `list`, `tuple`, `set`, `dict`.

25. What is the difference between `list` and `tuple`? 

Ans :- `list` is mutable; `tuple` is immutable.

26. What is a dictionary in Python? 

Ans :- A collection of key-value pairs.  

d = {“name”: “Alice”, “age”: 25}

27. What are mutable data types?  

Ans :- Data types that can be modified (e.g., `list`, `dict`, `set`).

28. What are immutable data types?  

Ans :- Data types that cannot be modified (e.g., `int`, `float`, `tuple`, `str`).

29. What is an expression in Python?

Ans :- A combination of variables, operators, and values that evaluates to a result.

30. What is the result of `2 + 3 * 4` in Python? 

Ans :- `14`, because of operator precedence.

31. What is type conversion? 

Ans :- Converting one data type into another.   int(“123”)

32. What is the difference between implicit and explicit conversion?**  

Ans :- Implicit is done automatically by Python; explicit requires manual conversion.

33. What are Python statements?

Ans :- Instructions executed by Python (e.g., assignment, conditional, loop).

34. What is a compound statement? 

Ans :- A statement that contains multiple instructions, like `if`, `for`, `while`.

35. What are IDEs, and give examples?  

Ans :- Integrated Development Environments, such as PyCharm, Jupyter, and VS Code.

36. What are control structures in Python?  

Ans :- Constructs like `if`, `for`, and `while` that control the flow of execution.

37. What is the syntax of an `if` statement?  

Ans :- if condition:

 38.What is the difference between `for` and `while` loops? 

Ans :- `for` is used for iterating over a sequence; `while` is used for repeated execution based on a condition.

39. What are jump statements in Python?  

Ans :- Statements like `break`, `continue`, and `pass` that alter the flow of execution.

40.What does the `break` statement do?  

Ans :- Exits the current loop prematurely.