Computer Science - Informatics Practices Class XI/XII Python List Solved Test  Part 5

Q1. Index value of first element in list is ___

Q2. Index value of last element in list is ____

Q3. Write one difference between indexing and

    slicing.

Q4. The syntax of slicing is:

       List[start : stop : step]

    Which argument is optional out of start,

    stop and step?

Q5. Write the output of the following:

            b = "Informatics"
            a=list(b)
            1.          print(a)
            2.          print(len(a))
            3.          print(a[1:4])
            4.          print(a[1:7])
            5.          print(a[3:])
            6.          print(a[:5])
            7.          print(a[4:17])
            8.          print(a[-2:-5:-1])
            9.          print(a[1:7:1])
            10.       print(a[1:7:2])
            11.       print(a[-5:])
            12.       print(a[:4])
            13.       print(a[-2:-5:-2])
            14.       print(a[11:15])
            15.       print(a[:])
            16.       print(a[::2])
            17.       print(a[-5:-1])
            18.       print(a[7:1:-1])
            19.       print(a[3:-3])
            20.       print(a[30:40])
            21.       print(a[17:-1])
            22.       print(a[10::-1])

 

Q6. Write a code to make copy of following list using copy function.

       a = [1,2,3,4]

Q7. What do you mean by append() function?

Q8. Write the output of the following:

code	output
>>> a = [1,2,3,4] >>> a.append(7) >>> a
>>> a = [1,2,3,4] >>> a.append([7,8]) >>> a

Solutions

Ans 1 : 0

Ans 2 : -1

Ans 3 : By indexing we can extract only one element of list while by slicing we can fetch a sub list from main list.

Ans 4 : Step

Ans 5 :

  1)          ['I', 'n', 'f', 'o', 'r', 'm', 'a', 't', 'i', 'c', 's']
2)          11
3)          ['n', 'f', 'o']
4)          ['n', 'f', 'o', 'r', 'm', 'a']
5)          ['o', 'r', 'm', 'a', 't', 'i', 'c', 's']
6)          ['I', 'n', 'f', 'o', 'r']
7)          ['r', 'm', 'a', 't', 'i', 'c', 's']
8)          ['c', 'i', 't']
9)          ['n', 'f', 'o', 'r', 'm', 'a']
10)       ['n', 'o', 'm']
11)       ['a', 't', 'i', 'c', 's']
12)       ['I', 'n', 'f', 'o']
13)       ['c', 't']
14)       []
15)       ['I', 'n', 'f', 'o', 'r', 'm', 'a', 't', 'i', 'c', 's']
16)       ['I', 'f', 'r', 'a', 'i', 's']
17)       ['a', 't', 'i', 'c']
18)       ['t', 'a', 'm', 'r', 'o', 'f']
19)       ['o', 'r', 'm', 'a', 't']
20)       []
21)       []
22)       ['s', 'c', 'i', 't', 'a', 'm', 'r', 'o', 'f', 'n', 'I']

Ans 6.

>>> import copy

>>> a = [1,2,3,4]

>>> b=copy.copy(a)

Ans 7. Append function add one element or a list at the end of the list.

Ans 8.

code	output
>>> a = [1,2,3,4] >>> a.append(7) >>> a	[1,2,3,4,7]
>>> a = [1,2,3,4] >>> a.append([7,8]) >>> a	[1,2,3,4,[7,8]]