Question

Questions

1. How to create a comment in python?

2. The way to obtain user input from command line

3. List standard mathematical operators in python and explain them

4. List comparison operators in python

5. Explain while loop. Give example

6. Explain for loop. Give example

7. How to create infinite loop? And how to stop it?

8. Explain a built-in function ‘range’ for ‘for’ loop

9. Explain break statement

10. Explain continue statement

11. Explain pass statement

12. What is the string?

13. String literals (how to create a string)

14. Name at least 4 string methods

15. What is the List?

16. Name at least 4 list methods

17. Name two ways to delete all elements of the list

18. Name the ways to add elements to list

19. What is the tuple?

20. How to create a tuple with one element?

21. How to Access Values in Tuples

22. How to Update Tuples

23. How to Remove Tuple Elements and Tuples

24. How to find smallest number from the tuple of numbers?

25. How can we sort dictionary keys alphabetically? Show examples

26. Name operations that change a dictionary object in-place(by key). Give example

27. Name operations that checks an existence of some key in dictionary

28. How to Remove Dictionary Elements

29. Explain how two dictionaries are compared

30. What data types can be used as key for dictionaries?

31. What is the function?

32. Why use functions?

33. Create a function that return sum of two input arguments.

34. Create a function that checks if the given number is positive or not.

35. Create a function that calculates square of given input value.

36. What is the module in python?

37. How to create a module?

38. The process of importing a module requires a process called a path search. Where python will make a search?

39. How to ‘bring in’ a module to program?

40. List at least 4 methods from Math module and explain them

41. Explain random.seed() method

42. Explain random.randrange(start, stop, step) method

43. Explain random.choice(seq) method

44. Explain random.shuffle(seq) method

45. Explain random.sample(seq,n) method

46. Explain random.random() method

47. How to open a file with name ‘test.txt’ to read from file?

48. Explain the access mode ‘w’ for opening file

49. Explain the access mode ‘a’ for opening file

50. Explain the access mode ‘r’ for opening file

51. Explain the access mode ‘r+’ for opening file

52. What is the default access mode and explain it

53. What kind of built in methods of file object can be used to get (input) information from file?

54. What kind of built in methods of file object can be used to store (output) information to file?

55. Explain methods tell() and seek() of file object

56. Standard files in python

57. What is the ‘pickling’?

58. What is ‘unpickling’?

59. What is exception?

60. Explain try-except statement

61. else clause in try-except statement

62. finally clause in try-except statement

63. Explain try-finally statement

64. The usage of regular expressions

Answer 1

Q1:-How to create a comment in Python?
ans:-
1)Single Line Comment-
   '#' is used to create a single line comment in python.
   e.g:-
       # This is Single Line Comment. Anything written here is ignored by Python
       print("Hello Students!")
2) Multi-Line Comment:-
   We can add a multiline comment in python code using triple quotes
   e.g:-
       '''
           This is a Multi-Line Comment.
           Anything written here is ignored by Python
       '''
       print("Hello Students!")

Q2:-way to obtain user input from command line
ans:-
   To take input from the user from command line we make use of a built-in function input().
   e.g1
       #accept command line input
       num=input();
       print(num);
Q3:-List standard mathematical operators in python and explain them
ans:-

   i)Addition(+):
       adds two operands                      
       Syntax:-a + b
   ii)Subtraction(-):
       subtracts two operands              
       Syntax:-a - b
   iii)Multiplication(*):
       multiplies two operands      
       Syntax:-a * b
   iv)Division -float(/):
       divides the first operand by the second  
       Syntax:-a / b
   v)Division-floor(//):
       divides the first operand by the second  
       Syntax:-a // b
   vi)Modulus(%):
       returns the remainder when first operand is divided by the second  
       Syntax:-a % b

Q5:- Explain while loop. Give example
ans:-
   Repeats a block of statements while a given condition is TRUE.
   Syntax:-
       while (Condition):
       #block of statements
   e.g
       #Program to find factorial using while
       print('Enter num to find factorial:-');
       num=input();
       i=1
       fact=1;
       while i < num:
           i=i+1;
           fact=fact*i
       print('Factorial:-');
       print(fact);