Lists – NCERT Class 11 Computer Science Chapter 9 – List Operations, Traversal, and Methods in Python

Covers lists as mutable ordered sequences that can contain elements of different data types. Explains list creation, accessing elements through indexing, mutability, and various list operations like concatenation, repetition, membership, and slicing. Details traversal techniques using loops, and extensive built-in list methods such as append, extend, insert, remove, pop, sort, reverse, and copying lists. Includes nested lists and passing lists as function arguments for practical programming applications.

Updated: 8 months ago

Categories: NCERT, Class XI, Computer Science, Python, Lists, List Operations, List Methods, Chapter 9

Tags: Lists, List Operations, Mutable Sequences, Indexing, Slicing, Traversal, Append, Extend, Insert, Remove, Pop, Sort, Reverse, Nested Lists, Copying Lists, Python Lists, NCERT Class 11, Computer Science, Chapter 9

Lists: NCERT Class 11 Chapter 9 - Enhanced Study Guide, Precise Notes, Diagrams & Quiz 2025

Enhanced Full Chapter Summary & Precise Notes from NCERT PDF (18 Pages)

Overview & Key Concepts

Exact Definition: "The data type list is an ordered sequence which is mutable and made up of one or more elements."

Introduction: Mutable sequences (unlike immutable strings); Mixed data types; Indexing from 0; Square brackets [].
Chapter Structure: Creation/accessing/mutability, Operations (concat/rep/mem/slice), Traversing, Methods/functions, Nested lists, Copying, Arguments to functions, Manipulation (programs).
2025 Relevance: Lists in data structures (e.g., arrays in ML); Dynamic arrays in pandas; Mutable for real-time updates.

9.1 Introduction to List

Precise: Ordered, mutable sequence; Elements: int/float/str/tuple/list; Enclosed in []; Comma-separated.

9.1.1 Accessing Elements

Precise: [index] (0 to n-1, -1 to -n); len() for length. Expanded: IndexError out-of-range; Expressions as index if int.

Precise Example 9.1: List Creation (SVG)

9.1.2 Lists are Mutable

Precise: Contents changeable post-creation; list[3] = 'Black'.

Precise Table 9.1: Indexing [2,4,6,8,10,12] (SVG)

9.2 List Operations

Precise: + (concat), * (rep), in/not in (mem), [n:m:k] (slice). Expanded: No change to originals in concat; TypeError mixing types.

9.3 Traversing a List

Precise: for item in list; for i in range(len(list)); while i < len(list).

9.4 Methods/Functions

Precise: len(), list(), append(), extend(), insert(), count(), index(), remove(), pop(), reverse(), sort(), sorted(), min(), max(), sum().

9.5 Nested Lists

Precise: List in list; Access: list1[i][j].

9.6 Copying Lists

Precise: Shallow: [:], list(), copy.copy(); Assignment aliases.

9.7 List as Argument to Function

Precise: Pass by reference; Changes reflect unless reassigned inside.

9.8 List Manipulation

Precise: Menu-driven (9-3); Average (9-4); Linear search (9-5).

Enhanced Features (2025)

Full PDF integration, expanded programs (9-1 to 9-5), SVGs (indexing/slicing), detailed tables/examples, NCERT Exercises Q&A updated, 10-Q quiz. Focus: List manipulation in Python.

Exam Tips

Predict outputs (slicing/mutability); Write UDFs (increment/search); List methods (Table 9.1); Explain copying/arguments; Practice traversal/loops.

Method	Description	Example
len()	Returns length	len([10,20,30]) → 3
list()	Creates list from sequence	list('aeiou') → ['a','e','i','o','u']
append(x)	Adds x at end	[10,20].append(30) → [10,20,30]
extend(lst)	Adds elements of lst	[10,20].extend([30,40]) → [10,20,30,40]
insert(i,x)	Inserts x at i	[10,20].insert(1,15) → [10,15,20]
count(x)	Occurrences of x	[10,20,10].count(10) → 2
index(x)	First index of x	[10,20,30].index(20) → 1
remove(x)	Removes first x	[10,20,10].remove(10) → [20,10]
pop(i)	Removes/returns at i	[10,20,30].pop(1) → 20; List: [10,30]
reverse()	Reverses in-place	[1,2,3].reverse() → [3,2,1]
sort()	Sorts in-place	[3,1,2].sort() → [1,2,3]
sorted()	New sorted list	sorted([3,1,2]) → [1,2,3]
min()	Smallest element	min([3,1,2]) → 1
max()	Largest element	max([3,1,2]) → 3
sum()	Sum of elements	sum([1,2,3]) → 6

Handling Lists - Programs 9-1 to 9-5 Expanded

Core: UDFs for increment, average, search; Menu-driven manipulation.

Program 9-1: increment(list2)

# Program 9-1
def increment(list2):
    for i in range(0, len(list2)):
        list2[i] += 5
    print('Reference of list Inside Function', id(list2))

list1 = [10,20,30,40,50]
print("Reference of list in Main", id(list1))
print("The list before the function call")
print(list1)
increment(list1)
print("The list after the function call")
print(list1)

Output: Reference of list in Main [some id]
The list before the function call
[10, 20, 30, 40, 50]
Reference of list Inside Function [same id]
The list after the function call
[15, 25, 35, 45, 55]

Program 9-2: increment with Reassignment (No Change)

# Program 9-2
def increment(list2):
    print("\nID of list inside function before assignment:", id(list2))
    list2 = [15,25,35,45,55]
    print("ID of list changes inside function after assignment:", id(list2))
    print("The list inside the function after assignment is:")
    print(list2)

list1 = [10,20,30,40,50]
print("ID of list before function call:", id(list1))
print("The list before function call:")
print(list1)
increment(list1)
print('\nID of list after function call:', id(list1))
print("The list after the function call:")
print(list1)

Output: ID of list before function call: [id1]
The list before function call:
[10, 20, 30, 40, 50]
ID of list inside function before assignment: [id1]
ID of list changes inside function after assignment: [id2]
The list inside the function after assignment is:
[15, 25, 35, 45, 55]
ID of list after function call: [id1]
The list after the function call:
[10, 20, 30, 40, 50]

Program 9-3: Menu-Driven List Operations

# Program 9-3 (Snippet - Full in PDF)
myList = [22,4,16,38,13]
choice = 0
while True:
    print("The list 'myList' has the following elements", myList)
    print("\nL I S T   O P E R A T I O N S")
    print(" 1. Append an element")
    # ... (full menu code)
    choice = int(input("ENTER YOUR CHOICE (1-10): "))
    if choice == 1:
        element = int(input("Enter the element to be appended: "))
        myList.append(element)
        print("The element has been appended\n")
    # ... (other cases)
    elif choice == 10:
        break
    else:
        print("Choice is not valid")

Sample Output: The list 'myList' has the following elements [22, 4, 16, 38, 13]
L I S T O P E R A T I O N S
1. Append an element
...
ENTER YOUR CHOICE (1-10): 8
The list has been sorted in reverse order
The list 'myList' has the following elements [38, 22, 16, 13, 4]

Program 9-4: computeAverage(list1,n)

# Program 9-4
def computeAverage(list1,n):
    total = 0
    for marks in list1:
        total = total + marks
    average = total / n
    return average

list1 = []
print("How many students marks you want to enter: ")
n = int(input())
for i in range(0,n):
    print("Enter marks of student",(i+1),":")
    marks = int(input())
    list1.append(marks)
average = computeAverage(list1,n)
print("Average marks of",n,"students is:",average)

Output: How many students marks you want to enter:
5
Enter marks of student 1:
45
... (inputs)
Average marks of 5 students is: 68.8

Program 9-5: linearSearch(num,list1)

# Program 9-5
def linearSearch(num,list1):
    for i in range(0,len(list1)):
        if list1[i] == num:
            return i
    return None

list1 = []
print("How many numbers do you want to enter in the list: ")
maximum = int(input())
print("Enter a list of numbers: ")
for i in range(0,maximum):
    n = int(input())
    list1.append(n)
num = int(input("Enter the number to be searched: "))
result = linearSearch(num,list1)
if result is None:
    print("Number",num,"is not present in the list")
else:
    print("Number",num,"is present at",result + 1, "position")

Output: How many numbers do you want to enter in the list:
5
Enter a list of numbers:
23
567
12
89
324
Enter the number to be searched:12
Number 12 is present at 3 position

Tip: 2025: Lists in algorithms (e.g., sorting for search engines).

NCERT Exercises - Questions & Answers

Based on full NCERT Chapter 9. Structured like textbook with full questions and detailed answers.

Question 1: What will be the output of the following statements?

i. list1 = [12,32,65,26,80,10]
list1.sort()
print(list1)

Ans: [10, 12, 26, 32, 65, 80]

ii. list1 = [12,32,65,26,80,10]
sorted(list1)
print(list1)

Ans: [12, 32, 65, 26, 80, 10] (Original unchanged)

iii. list1 = [1,2,3,4,5,6,7,8,9,10]
list1[::-2]
list1[:3] + list1[3:]

Ans: [10,8,6,4,2]
[1,2,3,4,5,6,7,8,9,10]

iv. list1 = [1,2,3,4,5]
list1[len(list1)-1]

Ans: 5

Question 2: Consider the following list myList. What will be the elements of myList after the following two operations:
myList = [10,20,30,40]

i. myList.append([50,60])

Ans: [10, 20, 30, 40, [50, 60]]

ii. myList.extend([80,90])

Ans: [10, 20, 30, 40, [50, 60], 80, 90]

Question 3: What will be the output of the following code segment:
myList = [1,2,3,4,5,6,7,8,9,10]
for i in range(0,len(myList)):
if i%2 == 0:
print(myList[i])

Ans:

1
3
5
7
9

Question 4: What will be the output of the following code segments?

a. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[3:]
print(myList)

Ans: [1, 2, 3]

b. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[:5]
print(myList)

Ans: [6, 7, 8, 9, 10]

c. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[::2]
print(myList)

Ans: [2, 4, 6, 8, 10]

Question 5: Differentiate between append() and extend() functions of list.

Ans:

append(): Adds single element (or list as one) at end.
extend(): Adds each element of iterable separately at end.
Example: [1,2].append([3,4]) → [1,2,[3,4]]
[1,2].extend([3,4]) → [1,2,3,4]

Question 6: Consider a list: list1 = [6,7,8,9]
What is the difference between the following operations on list1:

a. list1 * 2

Ans: [6,7,8,9,6,7,8,9] (New list)

b. list1 *= 2

Ans: list1 becomes [6,7,8,9,6,7,8,9] (In-place)

c. list1 = list1 * 2

Ans: list1 becomes [6,7,8,9,6,7,8,9] (Reassign)

Question 7: The record of a student ... stRecord = ['Raman','A-36',[56,98,99,72,69], 78.8]
Write Python statements to retrieve:

a) Percentage of the student

Ans: print(stRecord[3]) # 78.8

b) Marks in the fifth subject

Ans: print(stRecord[2][4]) # 69

c) Maximum marks of the student

Ans: print(max(stRecord[2])) # 99

d) Roll no. of the student

Ans: print(stRecord[1]) # 'A-36'

e) Change the name ... to ‘Raghav’

Ans: stRecord[0] = 'Raghav'

Programming Problems (Sample Solutions)

1. Write a program to find the number of times an element occurs in the list.

Ans:

def countElement(lst, elem):
    return lst.count(elem)
myList = [1,2,3,1,4,1]
print(countElement(myList, 1))  # 3

2. Write a program to read a list of n integers ... positive/negative lists.

Ans:

n = int(input("Enter n: "))
lst = [int(input()) for _ in range(n)]
pos = [x for x in lst if x > 0]
neg = [x for x in lst if x < 0]
print("Original:", lst)
print("Positive:", pos)
print("Negative:", neg)

3. Write a function that returns the largest element of the list passed as parameter.

Ans:

def largest(lst):
    return max(lst)
print(largest([1,5,3]))  # 5

4. Write a function to return the second largest number from a list of numbers.

Ans:

def secondLargest(lst):
    return sorted(lst)[-2]
print(secondLargest([1,5,3,7]))  # 5

5. Write a program to read a list of n integers and find their median.

Ans:

n = int(input())
lst = sorted([int(input()) for _ in range(n)])
if n % 2 == 0:
    med = (lst[n//2 - 1] + lst[n//2]) / 2
else:
    med = lst[n//2]
print("Median:", med)

6. Write a program to read a list of elements. Modify this list so that it does not contain any duplicate elements.

Ans:

lst = [int(input()) for _ in range(int(input("Size: ")))]
unique = []
for x in lst:
    if x not in unique:
        unique.append(x)
print(unique)

7. Write a program to read a list of elements. Input an element ... insert at position.

Ans:

lst = [int(input()) for _ in range(int(input("Size: ")))]
elem = int(input("Element: "))
pos = int(input("Position: "))
lst.insert(pos, elem)
print(lst)

8. Write a program to read elements of a list.
a) Delete by position.
b) Delete by value.

Ans:

lst = [int(input()) for _ in range(int(input("Size: ")))]
pos = int(input("Position to delete: "))
if 0 <= pos < len(lst):
    del lst[pos]
print("After pos delete:", lst)
val = int(input("Value to delete: "))
if val in lst:
    lst.remove(val)
print("After val delete:", lst)

9. Read a list of n elements. Pass this list to a function which reverses this list in-place without creating a new list.

Ans:

def reverseInPlace(lst):
    lst.reverse()
n = int(input())
lst = [int(input()) for _ in range(n)]
reverseInPlace(lst)
print(lst)

Tip: Practice these for board exams; Focus on outputs and UDF logic.

Concept	Precise Description	Example	Process/2025 Note
Creation	Square brackets, mixed types	[1,'a',[2]]	Nested allowed
Accessing	[0 to n-1]; [-n to -1]	list[0] → 2	len() for bound
Mutability	Change post-create	list[1]=3	Unlike strings
Operations	+ * in [n:m:k]	[1]*2 → [1,1]	Slice step
Traversal	for/while loops	for item in list	Access each elem
Methods	Built-in manip	list.append(x)	Table 9.1
Nested	List in list	list[4][1] → 7	Double index
Copying	Shallow copies	list[:] → Clone	Avoid alias
Arguments	Pass by ref	Changes reflect	Unless reassign
Manipulation	UDF programs	Menu-driven	Sort/search

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10 Qs · ~10 min

#100

Class 11 Business Studies — MSME and Business Entrepreneurship (Practice Quiz)

10 Qs · ~10 min

#101

Class 11 Business Studies — Sources of Business Finance (Practice Quiz)

10 Qs · ~10 min

#102

Class 11 Business Studies — Formation of a Company (Practice Quiz)

10 Qs · ~10 min

#103

Class 11 Business Studies — Social Responsibilities of Business and Business Ethics (Practice Quiz)

10 Qs · ~10 min

#104

Class 11 Business Studies — Emerging Modes of Business (Practice Quiz)

10 Qs · ~10 min

#105

Class 11 Business Studies — Business Services (Practice Quiz)

10 Qs · ~10 min

#106

Class 11 Business Studies — Private, Public and Global Enterprises (Practice Quiz)

10 Qs · ~10 min

#107

Class 11 Business Studies — Forms of Business Organisation (Practice Quiz)

10 Qs · ~10 min

#108

Class 11 Business Studies — Business, Trade and Commerce (Practice Quiz)

10 Qs · ~10 min

#109

Class 11 Accountancy — Financial Statements - II (Practice Quiz)

10 Qs · ~10 min

#110

Class 11 Accountancy — Financial Statements - I (Practice Quiz)

10 Qs · ~10 min

#111

Class 11 Accountancy — Depreciation, Provisions and Reserves (Practice Quiz)

10 Qs · ~10 min

#112

Class 11 Accountancy — Trial Balance and Rectification of Errors (Practice Quiz)

10 Qs · ~10 min

#113

Class 11 Accountancy — Bank Reconciliation Statement (Practice Quiz)

10 Qs · ~10 min

#114

Class 11 Accountancy — Recording of Transactions - II (Practice Quiz)

10 Qs · ~10 min

#115

Class 11 Accountancy — Recording of Transactions - I (Practice Quiz)

10 Qs · ~10 min

#116

Class 11 Accountancy — Theory Base of Accounting (Practice Quiz)

10 Qs · ~10 min

#117

Class 11 Accountancy — Introduction to Accounting (Practice Quiz)

10 Qs · ~10 min

#118

Class 11 Maths — Probability (Practice Quiz)

10 Qs · ~10 min

#119

Class 11 Maths — Statistics (Practice Quiz)

10 Qs · ~10 min

#120

Class 11 Maths — Limits and Derivatives (Practice Quiz)

10 Qs · ~10 min

#121

Class 11 Maths — Introduction to Three Dimensional Geometry (Practice Quiz)

10 Qs · ~10 min

#122

Class 11 Maths — Conic Sections (Practice Quiz)

10 Qs · ~10 min

#123

Class 11 Maths — Straight Lines (Practice Quiz)

10 Qs · ~10 min

#124

Class 11 Maths — Sequences and Series (Practice Quiz)

10 Qs · ~10 min

#125

Class 11 Maths — Binomial Theorem (Practice Quiz)

10 Qs · ~10 min

#126

Class 11 Maths — Permutations and Combinations (Practice Quiz)

10 Qs · ~10 min

#127

Class 11 Maths — Linear Inequalities (Practice Quiz)

10 Qs · ~10 min

#128

Class 11 Maths — Complex Numbers and Quadratic Equations (Practice Quiz)

10 Qs · ~10 min

#129

Class 11 Maths — Relations and Functions (Practice Quiz)

10 Qs · ~10 min

#130

Class 11 Maths — Sets (Practice Quiz)

10 Qs · ~10 min

#131

Class 11 Biology — Chemical Coordination and Integration (Practice Quiz)

10 Qs · ~10 min

#132

Class 11 Biology — Neural Control and Coordination (Practice Quiz)

10 Qs · ~10 min

#133

Class 11 Biology — Locomotion and Movement (Practice Quiz)

10 Qs · ~10 min

#134

Class 11 Biology — Excretory Products and their Elimination (Practice Quiz)

10 Qs · ~10 min

#135

Class 11 Biology — Body Fluids and Circulation (Practice Quiz)

10 Qs · ~10 min

#136

Class 11 Biology — Breathing and Exchange of Gases (Practice Quiz)

10 Qs · ~10 min

#137

Class 11 Biology — Plant Growth and Development (Practice Quiz)

10 Qs · ~10 min

#138

Class 11 Biology — Respiration in Plants (Practice Quiz)

10 Qs · ~10 min

#139

Class 11 Biology — Photosynthesis in Higher Plants (Practice Quiz)

10 Qs · ~10 min

#140

Class 11 Biology — Cell Cycle and Cell Division (Practice Quiz)

10 Qs · ~10 min

#141

Class 11 Biology — Biomolecules (Practice Quiz)

10 Qs · ~10 min

#142

Class 11 Biology — Cell: The Unit of Life (Practice Quiz)

10 Qs · ~10 min

#143

Class 11 Biology — Structural Organisation in Animals (Practice Quiz)

10 Qs · ~10 min

#144

Class 11 Biology — Anatomy of Flowering Plants (Practice Quiz)

10 Qs · ~10 min

#145

Class 11 Biology — Morphology of Flowering Plants (Practice Quiz)

10 Qs · ~10 min

#146

Class 11 Biology — Animal Kingdom (Practice Quiz)

10 Qs · ~10 min

#147

Class 11 Biology — Plant Kingdom (Practice Quiz)

10 Qs · ~10 min

#148

Class 11 Biology — Biological Classification (Practice Quiz)

10 Qs · ~10 min

#149

Class 11 Biology — The Living World (Practice Quiz)

10 Qs · ~10 min

#150

Class 11 Chemistry — Hydrocarbons (Practice Quiz)

10 Qs · ~10 min

#151

Class 11 Chemistry — Organic Chemistry – Some Basic Principles and Techniques (Practice Quiz)

10 Qs · ~10 min

#152

Class 11 Chemistry — Redox Reactions (Practice Quiz)

10 Qs · ~10 min

#153

Class 11 Chemistry — Equilibrium (Practice Quiz)

10 Qs · ~10 min

#154

Class 11 Chemistry — Chemical Bonding and Molecular Structure (Practice Quiz)

10 Qs · ~10 min

#155

Class 11 Chemistry — Classification of Elements and Periodicity in Properties (Practice Quiz)

10 Qs · ~10 min

#156

Class 11 Chemistry — Some Basic Concepts of Chemistry (Practice Quiz)

10 Qs · ~10 min

#157

Class 11 Physics — Waves (Practice Quiz)

10 Qs · ~10 min

#158

Class 11 Physics — Oscillations (Practice Quiz)

10 Qs · ~10 min

#159

Class 11 Physics — Kinetic Theory (Practice Quiz)

10 Qs · ~10 min

#160

Class 11 Chemistry — Thermodynamics (Practice Quiz)

10 Qs · ~10 min

#161

Class 11 Physics — Thermal Properties of Matter (Practice Quiz)

10 Qs · ~10 min

#162

Class 11 Physics — Mechanical Properties of Fluids (Practice Quiz)

10 Qs · ~10 min

#163

Class 11 Physics — Mechanical Properties of Solids (Practice Quiz)

10 Qs · ~10 min

#164

Class 11 Physics — Gravitation (Practice Quiz)

10 Qs · ~10 min

#165

Class 11 Physics — Systems of Particles and Rotational Motion (Practice Quiz)

10 Qs · ~10 min

#166

Class 11 Physics — Work, Energy and Power (Practice Quiz)

10 Qs · ~10 min

#167

Class 11 Physics — Motion in a Plane (Practice Quiz)

10 Qs · ~10 min

#168

Class 11 Physics — Motion in a Straight Line (Practice Quiz)

10 Qs · ~10 min

#169

Class 11 Physics — Units and Measurement (Practice Quiz)

10 Qs · ~10 min

#170

Class 11 Maths — Trigonometric Functions (Practice Quiz)

10 Qs · ~10 min

#171

Class 11 Chemistry — Structure of Atom (Practice Quiz)

10 Qs · ~10 min

#172

Class 11 Physics — Laws of Motion (Practice Quiz)

10 Qs · ~10 min

#173

Business Studies (Class 11) Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#174

Economics (Class 11) Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#175

Humanities Subjects Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#176

Motion in a Straight Line Practice Quiz | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

#177

Thermodynamic Processes and Laws Advanced Challenge | CBSE Class 11 Annual Assessment

10 Qs · ~10 min

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Lists – NCERT Class 11 Computer Science Chapter 9 – List Operations, Traversal, and Methods in Python

Lists

Enhanced Full Chapter Summary & Precise Notes from NCERT PDF (18 Pages)

Overview & Key Concepts

9.1 Introduction to List

9.1.1 Accessing Elements

Precise Example 9.1: List Creation (SVG)

9.1.2 Lists are Mutable

Precise Table 9.1: Indexing [2,4,6,8,10,12] (SVG)

9.2 List Operations

9.3 Traversing a List

9.4 Methods/Functions

9.5 Nested Lists

9.6 Copying Lists

9.7 List as Argument to Function

9.8 List Manipulation

Enhanced Features (2025)

Exam Tips

Lists Basics - Creation, Accessing & Mutability Expanded

9.1.1 Accessing (Detailed)

Indexing Flow (SVG)

9.1.2 Mutability:

List Operations - Concat, Rep, Mem, Slice Expanded

9.2 Operations (Detailed)

Slicing Example (SVG)

Example: Slicing

List Methods & Built-in Functions - Table 9.1 Expanded

Key Methods (Detailed)

Handling Lists - Programs 9-1 to 9-5 Expanded

Program 9-1: increment(list2)

Program 9-2: increment with Reassignment (No Change)

Program 9-3: Menu-Driven List Operations

Program 9-4: computeAverage(list1,n)

Program 9-5: linearSearch(num,list1)

NCERT Exercises - Questions & Answers

Question 1: What will be the output of the following statements?

i. list1 = [12,32,65,26,80,10]list1.sort()print(list1)

ii. list1 = [12,32,65,26,80,10]sorted(list1)print(list1)

iii. list1 = [1,2,3,4,5,6,7,8,9,10]list1[::-2]list1[:3] + list1[3:]

iv. list1 = [1,2,3,4,5]list1[len(list1)-1]

Question 2: Consider the following list myList. What will be the elements of myList after the following two operations:myList = [10,20,30,40]

i. myList.append([50,60])

ii. myList.extend([80,90])

Question 3: What will be the output of the following code segment:myList = [1,2,3,4,5,6,7,8,9,10]for i in range(0,len(myList)): if i%2 == 0: print(myList[i])

Ans:

Question 4: What will be the output of the following code segments?

a. myList = [1,2,3,4,5,6,7,8,9,10]del myList[3:]print(myList)

b. myList = [1,2,3,4,5,6,7,8,9,10]del myList[:5]print(myList)

c. myList = [1,2,3,4,5,6,7,8,9,10]del myList[::2]print(myList)

Question 5: Differentiate between append() and extend() functions of list.

Ans:

Question 6: Consider a list: list1 = [6,7,8,9]What is the difference between the following operations on list1:

a. list1 * 2

b. list1 *= 2

c. list1 = list1 * 2

Question 7: The record of a student ... stRecord = ['Raman','A-36',[56,98,99,72,69], 78.8]Write Python statements to retrieve:

a) Percentage of the student

b) Marks in the fifth subject

c) Maximum marks of the student

d) Roll no. of the student

e) Change the name ... to ‘Raghav’

Programming Problems (Sample Solutions)

1. Write a program to find the number of times an element occurs in the list.

2. Write a program to read a list of n integers ... positive/negative lists.

3. Write a function that returns the largest element of the list passed as parameter.

4. Write a function to return the second largest number from a list of numbers.

5. Write a program to read a list of n integers and find their median.

6. Write a program to read a list of elements. Modify this list so that it does not contain any duplicate elements.

7. Write a program to read a list of elements. Input an element ... insert at position.

8. Write a program to read elements of a list.a) Delete by position.b) Delete by value.

9. Read a list of n elements. Pass this list to a function which reverses this list in-place without creating a new list.

Quick Revision Notes & Enhanced Mnemonics

Creation

Accessing

Mutability

Operations

Traversal

Methods

Copying

Handling

i. list1 = [12,32,65,26,80,10]
list1.sort()
print(list1)

ii. list1 = [12,32,65,26,80,10]
sorted(list1)
print(list1)

iii. list1 = [1,2,3,4,5,6,7,8,9,10]
list1[::-2]
list1[:3] + list1[3:]

iv. list1 = [1,2,3,4,5]
list1[len(list1)-1]

Question 2: Consider the following list myList. What will be the elements of myList after the following two operations:
myList = [10,20,30,40]

Question 3: What will be the output of the following code segment:
myList = [1,2,3,4,5,6,7,8,9,10]
for i in range(0,len(myList)):
if i%2 == 0:
print(myList[i])

a. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[3:]
print(myList)

b. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[:5]
print(myList)

c. myList = [1,2,3,4,5,6,7,8,9,10]
del myList[::2]
print(myList)

Question 6: Consider a list: list1 = [6,7,8,9]
What is the difference between the following operations on list1:

Question 7: The record of a student ... stRecord = ['Raman','A-36',[56,98,99,72,69], 78.8]
Write Python statements to retrieve:

8. Write a program to read elements of a list.
a) Delete by position.
b) Delete by value.