Practise Questions (File Handling and Paths) (Q11-20)

Duration: 6 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Section A: General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, History, Geography, Indian Economy, GK- Current Affairs, Evolution of Indian Banking (Banking & Financial Awareness), Environment
  3. Section A: General Intelligence & Reasoning ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Directions (Direction Test), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Crypt Arithmetic, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence, TCS NQT Advanced Reasoning Ability
  4. Section A: Arithmetical & Numerical Ability: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Powers and Exponents (Surds and Indices), Algebra, Probability, Mental Ability, Age Problems, Partnership, Statistics, Arithmetic, Speed Mathematics and Basic Mathematics, Miscellaneous
  5. Section A: English Language & Comprehension: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Articles, Sentence Construction, Preposition, Direct and Indirect Speech, Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Modals, Active Passive Voice (Voice), Sentence Correction (Error Correction), Adverb, Conjunction, Cloze Test (Cloze Passage)
  6. Section A: Hindi Language & Comprehension: 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
  7. Section B: Programming, Data Structures, OOP & Java: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Language Design, Intro to Compilers, Visual Basics, Syntax Analysis: Bottom-Up, Object Oriented Technology
  8. Section B: Computer Networks, TCP/IP & Network Security: Introduction to CN, Data Communication, DLL: Flow Control, DLL: Access 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, Network Access Technologies, Network Security, Society, Law & Ethics, Mobile Computing, Net Layer:Routing Protocol, Cyber Safety and Security
  9. Section B: Teaching Methodology: Child Development, Concept of Pedagogy, Theories, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Curriculum Framework & Reforms, National Education Policy (NEP) 2020, Psychology, Teaching-Learning Process, Personality Development, Teaching Methods & Strategies, Learning and Motivation, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Nature, Objectives & Characteristics of Teaching, Teaching-Learning Aids & ICT Integration, Classroom Management & Communication, Evaluation, Assessment & Measurement, Curriculum & School Environment, Inclusive Education & Special Needs, Professional Development & Ethics
  10. Section B: Digital Electronics / Boolean Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  11. Section B: Operating Systems & Linux: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, File Management, Disc Scheduling, Unix OS, Linux OS, Distributed Systems, Windows OS
  12. Section B: Data Base Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, File Organization & Indexing, Transaction Management, Concurrency Control, Database Security & Authorization, Database Recovery, Data Warehousing & Mining
  13. Section B: Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, HTML Basics, CSS, Emerging Technologies, JavaScript-Basics, .Net Programming, Electronic Data Interchange and E-Commerce, XML
  14. Section B: Computer Fundamentals, IT Basics & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer, Terms & Abbreviations, MS Office Applications, Instr Formats & Modes, Floating Point Rep
  15. Section B: Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  16. Section B: Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, extras, Fundamentals of Systems and Information Systems
  17. Section B: Design & Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  18. Section B: Mathematics: Linear Algebra, Calculus, Trigonometry, Vectors, Set Theory, Functions, Relations, Propositional and Predicate Logic, Research Process Steps, Graph Theory
  19. Section B: Computer Graphics, Multimedia & Mobile Computing: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, Multimedia
  20. Section B: Emerging Trends: Emerging Tech Trends, Knowledge Representation, Natural Language Processing
  21. DSSSB Previous Year Paper:
  22. Business Studies and Management: Business Communication, Business Organization and Management, Financial Accounting, Business Economics, Management Information System (MIS), Knowledge Management & New Economy
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a lecture on Python file handling, presented as a series of multiple-choice questions. The instructor explains the behavior of various file operations. The first question (11) demonstrates that a file opened with a 'with' statement is automatically closed. The second question (12) shows that the `writelines()` method writes a list of strings to a file, with each string on a new line, and the output is 'A\nB\nC\n'. The third question (13) clarifies the difference between `write()` (which takes a string) and `writelines()` (which takes a list of strings). The fourth question (14) explains that the `read()` method reads the entire file. The fifth question (15) states that `readline()` reads the first line. The sixth question (16) confirms that `readlines()` returns a list. The seventh question (17) shows that `len(f.readlines())` gives the line count. The eighth question (18) explains that `seek(5)` moves the file pointer to the 5th character. The ninth question (19) states that `tell()` returns the current file pointer position. The final question (20) asks for the output of `f.tell()` immediately after opening a file, which is 0, as the pointer starts at the beginning.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with question 11, which asks about file closure. The code shown is `with open("x.txt", "w") as f: f.write("ABC")`. The instructor explains that when a file is opened using the `with` statement, it is automatically closed after the block of code is executed, even if an error occurs. The correct answer is B. Automatically. The instructor then moves to question 12, which presents the code `f = open("t.txt", "w")`, `f.writelines(["A\n", "B\n", "C\n"])`, `f.writelines(["A\n", "B\n", "C\n"])`, `f.close()`. The question asks for the output in the file. The instructor explains that `writelines()` writes a list of strings, and each string is written as is, so the output will be 'A\nB\nC\n'. The correct answer is C. A\nB\nC\n.

  2. 2:00 – 5:00 02:00-05:00

    The instructor proceeds to question 13, which asks for the difference between `write()` and `writelines()`. The options are A. write -> list, writelines() -> string, B. writelines() -> string, C. write -> string, writelines() -> list, D. No difference. The instructor explains that `write()` takes a single string argument, while `writelines()` takes a list of strings. The correct answer is C. The next question, 14, asks what `read()` does. The code is `f = open("t.txt", "r")`, `print(f.read())`. The instructor explains that `read()` reads the entire file and returns it as a single string. The correct answer is C. Reads entire file. Question 15 asks what `readline()` reads. The code is `f = open("t.txt", "r")`, `print(f.readline())`. The instructor states that `readline()` reads the first line of the file. The correct answer is B. First line only. Question 16 asks for the output type of `readlines()`. The code is `f = open("t.txt", "r")`, `print(f.readlines())`. The instructor explains that `readlines()` returns a list of strings, where each string is a line from the file. The correct answer is C. List.

  3. 5:00 – 6:05 05:00-06:05

    The video moves to question 17, which asks what `len(f.readlines())` gives. The code is `f = open("t.txt", "r")`, `print(len(f.readlines()))`. The instructor explains that `readlines()` returns a list of all lines, and `len()` returns the number of items in the list, which is the line count. The correct answer is C. Line count. Question 18 asks what `seek(5)` does. The code is `f = open("t.txt", "r")`, `f.seek(5)`, `print(f.read(3))`. The instructor explains that `seek()` moves the file pointer to a specific position, and `seek(5)` moves it to the 5th character (0-indexed). The correct answer is B. Moves to 5th character. Question 19 asks what the `tell()` method returns. The options are A. File size, B. Line number, C. Current file pointer position, D. Total characters. The instructor explains that `tell()` returns the current position of the file pointer. The correct answer is C. Current file pointer position. Finally, question 20 asks for the output of `f.tell()` just after opening a file. The code is `f = open("t.txt", "r")`, `print(f.tell())`. The instructor explains that the file pointer starts at position 0, so the output is 0. The correct answer is B. 0.

The video provides a comprehensive review of Python's file handling methods through a series of multiple-choice questions. It systematically covers the lifecycle of a file, from opening with `with` (automatic closure) to reading and writing operations. Key concepts include the difference between `write()` and `writelines()`, the behavior of `read()`, `readline()`, and `readlines()`, and the use of `seek()` and `tell()` for controlling and querying the file pointer. The instructor uses on-screen code and diagrams to clearly explain the expected output and behavior of each method, making it a practical guide for understanding file I/O in Python.

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