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 the Course: About the Course
  2. Section 1 | Language (Hindi): भाषा, लिपि और वर्ण, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, पद-भेद और रूप-विकार, 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, शब्द-भंडार, अपठित बोध, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  3. Section 1 | Language (उर्दू भाषा — 22 प्रश्न (निश्चित)): رسم الخط، حروفِ تہجی اور املا / Script, Alphabet and Spelling, اسم، ضمیر اور صفت / Nouns, Pronouns and Adjectives, الفاظ، محاورے اور ضرب الامثال / Vocabulary, Idioms and Proverbs, تفہیمِ عبارت، انشا اور ترجمہ / Comprehension, Writing and Translation, Comprehension
  4. Section 1 | Language (বাংলা / बांग्ला भाषा — 22 प्रश्न (निश्चित)): শব্দার্থ, বাগধারা ও ভাষাশুদ্ধি / Meaning, Idioms and Correct Usage, বাক্য ও বাচ্য / Sentences and Voice, শব্দগঠন ও শব্দভান্ডার / Word Formation and Vocabulary, অনুবাদ, বোধপরীক্ষণ ও রচনা / Translation, Comprehension and Composition
  5. Section 1 | Language (English): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Verbs and Tenses, Pronoun, Verb, Adverb, Prepositions and Conjunctions, Parts of Speech, Determiner, Conjunction, Modals, Transformation of Sentences, Direct and Indirect Speech, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Sentence Structure and Common Errors, Reading Comprehension, Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Facts, Inference and Judgements
  6. Section 2 | Primary Maths & Reasoning: अनुपात और समानुपात / Ratio and Proportion, Divisibility Rules, मिश्रण और एलिगेशन / Mixture and Alligation, Permutation and Combination, संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Sequence and Series (Series), समय, चाल और दूरी / Time, Speed and Distance, श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, अशाब्दिक तर्क / Non-Verbal Reasoning, प्रतिशत / Percentage, औसत / Average, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, समय और कार्य / Time and Work, घन क्षेत्रमिति / Solid Mensuration, Age Problems, Arithmetic, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, Algebra, Probability, Trigonometry, Syllogisms, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, Analytical Reasoning (Counting Figures Reasoning), गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, कैलेंडर एवं घड़ी / Calendar and Clock, Clock, घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, Data Arrangement, Inequality, सादृश्यता एवं वर्गीकरण / Analogy and Classification, क्रम एवं रैंकिंग / Order and Ranking, 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
  7. Section 2 | General Awareness (GK + Current Affairs): Polity, वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Biology, राज्य विशेष सामान्य ज्ञान / State-Specific General Knowledge, Chemistry, History, Geography, Indian Economy, Environment, समसामयिकी / 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): कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, Emerging Tech Trends, Society, Law & Ethics, MS Office Applications, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection, साइबर सुरक्षा / Cyber Safety and Security, कंप्यूटर सॉफ़्टवेयर / Computer Software, ऑपरेटिंग सिस्टम / Operating System, कंप्यूटर नेटवर्क / Computer Networks, वर्ड प्रोसेसिंग (MS Word) / Word Processing (MS Word), Terms & Abbreviations, प्रेज़ेंटेशन (MS PowerPoint) / Presentation Software (MS PowerPoint)
  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, OOPS with Java
  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 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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