![String Sequence • A string is a sequence of characters. • You can access the characters one at a time with the [ ] operator The expression in brackets is called an index.](https://image.slidesharecdn.com/pythonl19-l22-210601072806/75/Python-Programming-JNTUA-UNIT-3-Strings-5-2048.jpg)
![String slicing • A segment of a string is called a slice. • The operator [n : m] returns from the nth char to the (m-1)th char](https://image.slidesharecdn.com/pythonl19-l22-210601072806/75/Python-Programming-JNTUA-UNIT-3-Strings-15-2048.jpg)
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Python Programming | JNTUA | UNIT 3 | Strings |
This document contains summaries of three lectures (19-21) about strings in Python. It discusses that strings are sequences of characters that can be accessed individually by index and that the len() function returns the length of a string. It also describes how to traverse the characters of a string from beginning to end, slice strings to extract substrings, and that strings are immutable. Additional topics covered include searching for characters in strings, common string methods like count and find, using the in operator to check for substrings, and comparing strings.
Python Programming | JNTUA | UNIT 3 | Strings |
- 1. Python Programming Unit –III (Part II) (Lecture 19) Strings
- 2. Python Programming Unit –III (Part II) (Lecture 19) Strings String Sequence String Length String Traversal
- 3. Strings Lecture 19 Lecture20 String Sequence String Length Immutable Searching String slicing String Traversal String methods in operator Looping & Counting String Comparison Lecture 21
- 4. Strings Lecture 19 String Sequence StringLength String Traversal
- 5. String Sequence • Astring is a sequence of characters. • You can access the characters one at a time with the [ ] operator The expression in brackets is called an index.
- 6. Strings Lecture 19 String Sequence StringLength String Traversal
- 7. String Length len isa built-in function that returns the number of characters in a string How to find last character in string?
- 8. Strings Lecture 19 String Sequence StringLength String Traversal
- 9. String Traversal Start atthe beginning, select each character in turn and continue until the end is called a traversal.
- 10. Strings Lecture 19 String Sequence StringLength String Traversal
- 11. Python Programming Unit –III (Part II) (Lecture 20) Strings
- 12. Python Programming Unit –III (Part II) (Lecture 20) Strings Immutable Searching String slicing
- 13. Strings Lecture 19 Lecture20 String Sequence String Length Immutable Searching String slicing String Traversal String methods in operator Looping & Counting String Comparison Lecture 21
- 14.
- 15. String slicing • Asegment of a string is called a slice. • The operator [n : m] returns from the nth char to the (m-1)th char
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- 17. Immutable Strings are immutable, whichmeans you can’t change an existing string.
- 18.
- 19. Searching • It takesa character and finds the index where that character appears. • If the character is not found, the function returns -1
- 20.
- 21. Python Programming Unit –III (Part II) (Lecture 21) Strings
- 22. Python Programming Unit –III (Part II) (Lecture 21) Strings Looping & Counting String methods in operator String Comparison
- 23. Strings Lecture 19 Lecture20 String Sequence String Length Immutable Searching String slicing String Traversal String methods in operator Looping & Counting String Comparison Lecture 21
- 24. Strings String methods in operator Looping& Counting String Comparison Lecture 21
- 25.
- 26. Strings String methods in operator Looping& Counting String Comparison Lecture 21
- 27. String methods • Amethod is similar to a function. • It takes arguments and returns a value
- 28. Strings String methods in operator Looping& Counting String Comparison Lecture 21
- 29. in operator • Theword in is a Boolean operator that takes two strings. • if the first string appears as a substring in the second: returns True
- 30. Strings String methods in operator Looping& Counting String Comparison Lecture 21
- 31.
- 32. Strings String methods in operator Looping& Counting String Comparison Lecture 21
- 33. Python Programming Unit –III (Part III) (Lecture 22) Case Study
- 34. Lecture 22 Reading wordlists Search Looping with indices Case Study
- 35.
- 36. Lecture 22 Reading wordlists Search Looping with indices Case Study
- 37.
- 38.
- 39. Lecture 22 Reading wordlists Search Looping with indices Case Study
- 40. Looping with indices LE V E L
- 41. Lecture 22 Reading wordlists Search Looping with indices Case Study