Practice Set 5 (List and Set) Q1-13

Duration: 12 min

This video lesson is available to enrolled students.

Return to /learn/BIHAR-STET-COMPUTER-SCIENCE-COMPLETE-COURSE/unit-16-python/collections-strings/sets/asset-practice-set-5-list-and-set-q1-13 after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the course: About the Course
  2. Mathematical Aptitude: संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Divisibility Rules, प्रतिशत / Percentage, अनुपात और समानुपात / Ratio and Proportion, औसत / Average, लाभ, हानि और बट्टा / Profit, Loss and Discount, समय और कार्य / Time and Work, घन क्षेत्रमिति / Solid Mensuration, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, समय, चाल और दूरी / Time, Speed and Distance, Age Problems, मिश्रण और एलिगेशन / Mixture and Alligation, Algebra, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, Pipe and Cistern, Trigonometry, Statistics, आँकड़ा निर्वचन / Data Interpretation, Arithmetic, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers
  3. Logical Reasoning: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, सादृश्यता एवं वर्गीकरण / Analogy and Classification, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, क्रम एवं रैंकिंग / Order and Ranking, अशाब्दिक तर्क / Non-Verbal Reasoning, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, Syllogisms, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, Analytical Reasoning (Counting Figures Reasoning), घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, कैलेंडर एवं घड़ी / Calendar and Clock, Clock
  4. General Knowledge: वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Chemistry, Biology, History, Geography, Polity, Indian Economy, समसामयिकी / Current Affairs, Static General Knowledge
  5. Art of Teaching: शिक्षण-अधिगम प्रक्रिया एवं कक्षा प्रबंधन / Teaching-Learning Process and Classroom Management, Learners & Learning Process, Factors Affecting Teaching, शिक्षण विधियाँ एवं उपागम / Teaching Methods and Approaches, सूक्ष्म शिक्षण एवं कक्षा संप्रेषण / Microteaching and Classroom Communication, शिक्षण सहायक सामग्री एवं शैक्षिक तकनीकी / Teaching Aids and Educational Technology, आकलन एवं मूल्यांकन / Assessment and Evaluation, शिक्षक: गुण, व्यावसायिक नैतिकता एवं विकास / Teacher: Qualities, Professional Ethics and Development, शैक्षिक नीतियाँ, अधिनियम एवं प्रशासन / Educational Policies, Acts and Administration, पाठ्यचर्या, कला एवं सह-शैक्षिक क्षेत्र / Curriculum, Arts and Co-curricular Areas, निर्देशन एवं परामर्श / Guidance and Counselling, दिव्यांग बच्चों की शिक्षा / Education of Children with Disabilities, Micro-Teaching & Teaching Skills, पाठ योजना / Lesson Planning
  6. Environmental Science: Environment
  7. Unit 1 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  8. Unit 2 | COA: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer
  9. Unit 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  10. Unit 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. Unit 4 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  12. Unit 5 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  13. Unit 6 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control
  14. Unit 7 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer
  15. Unit 8 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  16. Unit 9 | Object Oriented Programming: OOPS with C++
  17. Unit 10 | Web Development: HTML Basics, CSS, JavaScript-Basics, XML, Node.js
  18. Unit 11 | Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  19. Unit 12 | IoT: Emerging Tech Trends, Cloud Computing, कंप्यूटर नेटवर्क / Computer Networks
  20. Unit 13 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Unit 14 | E-Commerce: Electronic Data Interchange and E-Commerce, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Physical Security and Cryptography Basics, Cyber Safety and Security
  22. Unit 15 | Multimedia: Multimedia
  23. Unit 16 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  24. Full Length Mock Tests — General Paper:
  25. Full Length Mock Tests — Computer Science (Paper II):
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a Python programming tutorial focused on the concepts of lists and sets, specifically addressing common pitfalls related to object references and shallow copying. The instructor begins by analyzing a question where a list A is assigned to another variable B, and then B is modified. The key concept demonstrated is that B is a reference to the same list object as A, so modifying B also changes A. The instructor then moves to a second question to illustrate the difference between shallow and deep copying. He shows that when a list contains a nested list, a shallow copy (using .copy()) creates a new outer list but shares the same inner list object. This means that modifying the inner list through one variable affects the other. The video uses a digital whiteboard to write out the code and its execution step-by-step, including the final state of the lists. The lesson concludes with a brief discussion on other list operations like extend, set operations, and list multiplication.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens on a digital whiteboard displaying a Python practice sheet titled 'Practice Set-V' with a section on 'LIST and SET'. The instructor begins with Question 1, which presents the code: A = [1, 2, 3], B = A, B.append(4), print(A). The instructor explains that since B is assigned the value of A, B is a reference to the same list object. When B.append(4) is executed, it modifies the list object that both A and B point to. Therefore, the final print(A) will output the modified list [1, 2, 3, 4]. The instructor writes the final state of the list as [1, 2, 3, 4] on the board, indicating the correct answer is B) [1, 2, 3, 4].

  2. 2:00 – 5:00 02:00-05:00

    The instructor transitions to Question 2, which demonstrates the concept of shallow copying. The code is: A = [1, 2, 3], B = A.copy(), B.append(4), print(A). The instructor explains that A.copy() creates a new list object, so B is a new list. Modifying B does not affect A, so the output of print(A) is [1, 2, 3]. He then moves to Question 3, which introduces a nested list: A = [1, 2, [3, 4]], B = A.copy(), B[2][0] = 99, print(A). The instructor explains that a shallow copy creates a new outer list, but the inner list [3, 4] is still shared between A and B. When B[2][0] = 99 is executed, it modifies the shared inner list, so A is also affected. The final output of print(A) is [1, 2, [99, 4]]. He writes 'Shallow Copy' on the board to label this concept.

  3. 5:00 – 10:00 05:00-10:00

    The instructor continues with Question 4: A = [i for i in range(4)], print(A[::2]). He explains that this is a list comprehension creating [0, 1, 2, 3], and the slice A[::2] returns every second element starting from index 0, resulting in [0, 2]. He then moves to Question 5: A = [1, 2, 3], A.insert(1, 4), A.insert(1, 5), print(len(A)). He explains that insert(1, 4) adds 4 at index 1, making the list [1, 4, 2, 3], and then insert(1, 5) adds 5 at index 1, making it [1, 5, 4, 2, 3]. The length is 5. The video then shows Question 6: A = [1, 2, 3], B = [4, 5], A.extend(B), print(A). The instructor explains that extend adds all elements of B to the end of A, resulting in [1, 2, 3, 4, 5]. Question 7: A = [10, 20, 30, 40], print(A[-2:-1]) is shown, and he explains the slice returns a list with the second-to-last element, [30].

  4. 10:00 – 12:24 10:00-12:24

    The instructor covers the final questions. Question 8: A = [1, 2, 3, 2, 1], print(set(A)), print(set(A)). He explains that set(A) removes duplicates, so it returns {1, 2, 3}. Question 9: A = {1, 2, 3}, B = {3, 4, 5}, print(A ^ B). He explains that ^ is the symmetric difference operator, which returns elements in either A or B but not in both, resulting in {1, 2, 4, 5}. Question 10: A = {1, 2, 3}, B = {3, 4, 5}, print(A == B). He states this is False. Question 11: A = {1, 2, 3}, B = {3, 4, 5}, print(A < B). He states this is False. Question 12: nums = [1, 2, 3, 4], print(nums.pop(nums.index(3))). He explains that nums.index(3) returns 2, and pop(2) removes and returns the element at index 2, which is 3. Question 13: A = [1, 2, 3], print(A * 2). He explains that this multiplies the list, resulting in [1, 2, 3, 1, 2, 3].

The video provides a comprehensive walkthrough of Python list and set operations, with a strong emphasis on understanding the difference between object assignment and copying. The core teaching point is the distinction between shallow and deep copying, illustrated through the behavior of nested lists. The instructor uses a clear, step-by-step approach, writing out the code and its execution on a digital whiteboard to visually demonstrate how changes to one variable can or cannot affect another. This practical, problem-solving approach helps students grasp the underlying memory model of Python objects, which is crucial for avoiding common bugs in their code.

Loading lesson…