1.37 Pre-Test Loop- While Loop

Duration: 7 min

This video lesson is available to enrolled students.

Return to /learn/BPSC/part-3-python/control-flow-looping/while-loop/asset-137-pre-test-loop-while-loop after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Section 1 | Language (Hindi): भाषा, लिपि, ध्वनि, वर्ण, अक्षर, स्वर, व्यंजन, मात्रा और संयुक्ताक्षर, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  3. Section 1 | Language (उर्दू भाषा — 22 प्रश्न (निश्चित)): Spelling & Diacritics, Grammar (اسم, فعل, صفت, ضمیر), Vocabulary, Idioms & Proverbs, Comprehension
  4. Section 1 | Language (বাংলা / बांग्ला भाषा — 22 प्रश्न (निश्चित)): Bangla Script and Sounds, Bangla Grammar and Usage, Bangla Word Formation and Vocabulary, Reading and Text Interpretation
  5. Section 1 | Language (English): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Verb, Adverb, Preposition, Articles, Determiner, Conjunction, Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Facts, Inference and Judgements
  6. Section 2 | Primary Maths & Reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Mensuration and Geometry, Age Problems, Arithmetic, Powers and Exponents (Surds and Indices), Algebra, Probability, Trigonometry, Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence
  7. Section 2 | General Awareness (GK + Current Affairs): Polity, Physics, Biology, State Wise GK, Chemistry, History, Geography, Indian Economy, Environment, GK- Current Affairs, Static General Knowledge
  8. Section 3 | Computer System and Org. (CSO): Basics of COA, Floating Point Rep, Cache Memory Organization, Instr Formats & Modes, Programming the Basic Computer, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design
  9. Section 3 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control
  10. Section 3 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Process Synchronization
  11. Section 3 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics
  12. Section 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Shortest Path Algos
  13. Section 3 | Theory Of Computation & Compiler Design: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization
  14. Section 3 | Emerging Trends (AI, Societal Ethics & MS Office): Artificial Intelligence, Emerging Tech Trends, Society, Law & Ethics, MS Office Applications
  15. Section 3 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Maintenance and Configuration Management, Software Testing
  16. Section 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Section 3 | OOPS, C++, JAVA, HTML: OOPS with C++, Java, HTML Basics, CSS
  18. Section 3 | Java: Java Fundamentals, Array, String, IO & References
  19. Section 3 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  20. Section 3 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  21. Section 3 | Multimedia: Multimedia
  22. BPSC Previous Year Papers:
  23. BPSC Full Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a comprehensive lecture on the 'While Loop' in Python, presented as a pre-test loop. The instructor begins by introducing the concept and its flowchart, which shows a condition being evaluated before the loop body executes. The syntax is clearly defined as 'while <condition>:', followed by indented statements. A practical example is provided to demonstrate a loop that prints the multiplication table of a user-input number from 1 to 10. The instructor then transitions to a 'Guess Output?' section, where he analyzes several code snippets. He walks through a loop that prints numbers 1 to 10, another that prints 'True' infinitely due to a 'while True' condition, and a third that iterates over a string '123789' to print each character. The lesson concludes with a 'Thank You' message, summarizing the key concepts of pre-test loops and their application in Python.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title slide for a Python lecture on 'Pre-test Loop: While Loop'. The instructor, a man in a black polo shirt, stands in front of a digital screen. He introduces the topic, explaining that a while loop is a pre-test loop, meaning the condition is checked before the loop body executes. He displays a 'While Loop Flow Chart' on the screen, which visually represents the process: a decision box for the 'Condition', a 'True' path leading to 'Repeated Actions', and a 'False' path leading out of the loop. He then presents the general syntax for a while loop: 'while <condition>:', followed by indented statements. The instructor begins to write an example on the screen, starting with 'num=int(input('Enter a number'))' to get user input.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues to build the example of a while loop. He writes the complete code for a multiplication table: 'while i<=10:', 'print(i*num)', and 'i=i+1'. He explains that the loop will run as long as the condition 'i<=10' is true. To illustrate the flow, he writes the variable 'i' and its initial value 'i=1' on the screen. He then demonstrates the loop's execution step-by-step, writing 'i=1', '1*10=10', 'i=2', '2*10=20', and so on, up to 'i=10', '10*10=100'. He emphasizes that the loop terminates when 'i' becomes 11, making the condition 'i<=10' false. He also highlights the 'while <condition>' part of the syntax, circling it to draw attention to its importance.

  3. 5:00 – 7:09 05:00-07:09

    The instructor transitions to a new section titled 'Guess Output?'. He presents three code snippets for analysis. The first is a loop that prints numbers 1 to 10, which he explains will output the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. The second snippet is a 'while True' loop with 'print(True)' and an 'else' block with 'print(False)'. He explains that this loop will run infinitely, printing 'True' repeatedly, and the 'else' block will never execute because the loop never terminates. The third snippet shows a loop over a string: 'a="123789"' and 'while x in a: print(x, end=" ")'. He explains that this loop will iterate through each character in the string '123789' and print them with a space, resulting in the output '1 2 3 7 8 9'. The video concludes with a 'Thank You' slide.

The video provides a clear and structured lesson on the Python while loop. It effectively uses a combination of visual aids, including a flowchart and code examples, to explain the concept of a pre-test loop. The instructor's step-by-step walkthrough of the multiplication table example is particularly effective in demonstrating the loop's execution flow. The 'Guess Output?' section serves as a practical application, testing the viewer's understanding of different loop scenarios, including infinite loops and string iteration. The overall progression from theory to practical examples and then to a problem-solving exercise creates a comprehensive learning experience.

Loading lesson…