Python Programming | JNTUA | UNIT 3 | Strings |

Jun 1, 20210 likes105 views

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
Unit – III (Part II)
(Lecture 19)
Strings

Python Programming
Unit – III (Part II)
(Lecture 19)
Strings
String Sequence String Length String Traversal

Strings
Lecture 19 Lecture 20
String Sequence
String Length Immutable
Searching
String slicing
String Traversal
String methods
in operator
Looping &
Counting
String Comparison
Lecture 21

Strings
Lecture 19
String Sequence
String Length
String Traversal

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.

String Length
len is a built-in function
that returns the number
of characters in a string
How to find last character in string?

String Traversal
Start at the beginning, select
each character in turn and
continue until the end is
called a traversal.

Python Programming
Unit – III (Part II)
(Lecture 20)
Strings

Python Programming
Unit – III (Part II)
(Lecture 20)
Strings
Immutable Searching
String slicing

Strings
Lecture 20
Immutable
Searching
String slicing

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

Immutable
Strings are immutable,
which means you can’t
change an existing string.

Searching
• It takes a character and finds
the index where that character
appears.
• If the character is not found,
the function returns -1

Python Programming
Unit – III (Part II)
(Lecture 21)
Strings

Python Programming
Unit – III (Part II)
(Lecture 21)
Strings
Looping &
Counting
String methods in operator String Comparison

Strings
String methods
in operator
Looping &
Counting
String Comparison
Lecture 21

String methods
• A method is similar to a
function.
• It takes arguments and
returns a value

in operator
• The word in is a Boolean
operator that takes two
strings.
• if the first string appears
as a substring in the
second: returns True

Python Programming
Unit – III (Part III)
(Lecture 22)
Case Study

Lecture 22
Reading word lists
Search
Looping with
indices
Case Study

In this approach, the pattern is made to slide over text one by one and test for a match. If a match is found while testing, then it returns the starting index number from where the pattern is found in the text and then slides by 1 again to check for subsequent matches of the pattern in the text. Copy the link given below and paste it in new browser window to get more information on Naive String Matching Algorithm:- http://www.transtutors.com/homework-help/computer-science/naive-string-matching-algorithm.aspx

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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 Lecture 20 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 String Length String Traversal

5. 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.

6. Strings Lecture 19 String Sequence String Length String Traversal

7. String Length len is a 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 String Length String Traversal

9. String Traversal Start at the beginning, select each character in turn and continue until the end is called a traversal.

10. Strings Lecture 19 String Sequence String Length 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 Lecture 20 String Sequence String Length Immutable Searching String slicing String Traversal String methods in operator Looping & Counting String Comparison Lecture 21

14. Strings Lecture 20 Immutable Searching String slicing

15. 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

16. Strings Lecture 20 Immutable Searching String slicing

17. Immutable Strings are immutable, which means you can’t change an existing string.

18. Strings Lecture 20 Immutable Searching String slicing

19. Searching • It takes a character and finds the index where that character appears. • If the character is not found, the function returns -1

20. Strings Lecture 20 Immutable Searching String slicing

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 Lecture 20 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. Looping & Counting

26. Strings String methods in operator Looping & Counting String Comparison Lecture 21

27. String methods • A method 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 • The word 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. String Comparison

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 word lists Search Looping with indices Case Study

35. Reading word lists

36. Lecture 22 Reading word lists Search Looping with indices Case Study

37. Search

38. Search

39. Lecture 22 Reading word lists Search Looping with indices Case Study

40. Looping with indices L E V E L

41. Lecture 22 Reading word lists Search Looping with indices Case Study

Python Programming | JNTUA | UNIT 3 | Strings |

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