6.8 String Methods Part - 2

Duration: 8 min

This video lesson is available to enrolled students.

Return to /learn/BPSC/part-3-python/collections-strings/strings/asset-68-string-methods-part-2 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 Python programming tutorial focusing on string methods. The instructor begins by introducing the 'expandtabs()' method, demonstrating its use with a string 'S = "P\tPython"' and showing how 'S.expandtabs(4)' replaces the tab character with four spaces. The lesson then moves to the 'find()' method, where the instructor explains that it returns the index of the first occurrence of a substring, or -1 if not found, using 'S = "Python"' and 'S.find('t')' as an example. Next, the 'format()' method is explained, showing how to use placeholders in a string like 'S = "My name is {}"' and then calling 'S.format("Kush")' to produce 'My name is Kush'. The 'index()' method is discussed as a variant of 'find()' that raises an error if the substring is not found. The tutorial concludes with a series of 'is' methods: 'isalnum()' returns True for strings with only alphanumeric characters (e.g., 'Hi123'), 'isalpha()' returns False for strings with digits (e.g., 'Hi123'), and 'isdigit()' returns True for strings with only digits (e.g., '2'). The final example shows 'isidentifier()' returning True for a valid variable name like 'Voxi'.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title slide for a Python lecture on 'String Methods-2'. The instructor, a man in a black polo shirt, stands in front of a digital blackboard. He begins by writing the title 'Expandtabs (tabsize)' in pink. He then writes the code example 'S = "P\tPython"' and demonstrates the 'expandtabs()' method with 'print(S.expandtabs(4))'. He explains that the tab character is replaced by four spaces, resulting in 'P Python'. He uses a pink arrow to visually connect the tab character in the original string to the four spaces in the output.

  2. 2:00 – 5:00 02:00-05:00

    The instructor transitions to the 'find' method. He writes 'find' on the board and provides an example: 'S = "Python"'. He then writes 'print(S.find('t'))' and explains that the method returns the index of the first occurrence of the substring 't', which is 2. He notes that if the substring is not found, the method returns -1. He then introduces the 'format()' method, writing 'format()' on the board. He shows an example with 'S = "My name is {}"' and demonstrates 'print(S.format("Kush"))', which outputs 'My name is Kush'. He explains that the curly braces are placeholders for the values passed to the format method.

  3. 5:00 – 8:06 05:00-08:06

    The instructor moves on to the 'index()' method, writing 'Index' on the board. He explains that it is similar to 'find()' but raises a ValueError if the substring is not found. He writes 'S = "Python"' and 'print(S.index('h'))', which returns 3. He then demonstrates the 'isalnum()' method with 'S = "Hi123"' and 'print(S.isalnum())', which returns True. He contrasts this with 'isalpha()' on the same string, which returns False because of the digits. He then shows 'isdigit()' with 'S = "2"', which returns True. Finally, he demonstrates 'isidentifier()' with 'S = "Voxi"', which returns True, and 'S1 = "1var"', which returns False, explaining that identifiers cannot start with a digit.

The video provides a structured, hands-on tutorial on several essential Python string methods. It progresses logically from basic formatting methods like 'expandtabs()' and 'format()' to search methods like 'find()' and 'index()', and concludes with validation methods like 'isalnum()', 'isalpha()', 'isdigit()', and 'isidentifier()'. The instructor uses clear, concise examples on a digital whiteboard to demonstrate the syntax, behavior, and return values of each method, making the concepts accessible for learners. The consistent use of the variable 'S' and the 'print()' function helps reinforce the practical application of these methods in code.

Loading lesson…