This document contains summaries of several lectures about Python lists. It discusses how lists are sequences that can be indexed and traversed, are mutable unlike strings, and how list operations like slicing, methods, filtering and mapping can be used. It also covers deleting list elements, converting strings to lists, aliasing, passing lists as arguments and checking object references.

1. Python Programming
Unit – III (Part IV)
(Lecture 23)
Lists

2. Python Programming
Unit – III (Part IV)
(Lecture 23)
Lists
List is a sequence Lists are mutable Traversing a list

3. Lists
Lecture 23
List is a sequence
Lists are mutable List slices
List methods
List operations
Traversing a list
Deleting elements
Lists and Strings
Map filter &
reduce
Aliasing
List arguments
Objects and
values
Lecture 25
Lecture 24
Lecture 26

4. Lists
Lecture 23
List is a sequence
Lists are mutable
Traversing a list

5. List is a sequence
• List is a sequence of
elements (items) of
any type.
• Create a new list by
using [ ] .

6. Lists
Lecture 23
List is a sequence
Lists are mutable
Traversing a list

7. Lists are mutable
• Unlike strings, lists are
mutable.
• Index is applied same as
strings.

8. Lists
Lecture 23
List is a sequence
Lists are mutable
Traversing a list

9. Traversing a list
• Traverse the elements of a
list using for loop.

10. Lists
Lecture 23
List is a sequence
Lists are mutable
Traversing a list

11. Python Programming
Unit – III (Part IV)
(Lecture 24)
Lists

12. Python Programming
Unit – III (Part IV)
(Lecture 24)
Lists
List slices List methods
List operations

13. Lists
Lecture 23
List is a sequence
Lists are mutable List slices
List methods
List operations
Traversing a list
Deleting elements
Lists and Strings
Map filter &
reduce
Aliasing
List arguments
Objects and
values
Lecture 25
Lecture 24
Lecture 26

14. Lists
Lecture 24
List slices
List methods
List operations

15. List operations

16. Lists
Lecture 24
List slices
List methods
List operations

17. List slices

18. Lists
Lecture 24
List slices
List methods
List operations

19. List methods

20. Lists
Lecture 24
List slices
List methods
List operations

21. Python Programming
Unit – III (Part IV)
(Lecture 25)
Lists

22. Python Programming
Unit – III (Part IV)
(Lecture 25)
Lists
Deleting elements Lists and Strings
Map, filter &
reduce

23. Lists
Lecture 23
List is a sequence
Lists are mutable List slices
List methods
List operations
Traversing a list
Deleting elements
Lists and Strings
Map, filter &
reduce
Aliasing
List arguments
Objects and
values
Lecture 25
Lecture 24
Lecture 26

24. Lists
Deleting elements
Lists and Strings
Map, filter &
reduce
Lecture 25

25. Map, filter & reduce
my_pets = ['alfred', 'tabitha', 'william', 'arla’]
uppered_pets = []
for pet in my_pets:
pet_ = pet.upper()
uppered_pets.append(pet_)
print(uppered_pets)
my_pets = ['alfred', 'tabitha', 'william', 'arla’]
uppered_pets = list(map(str.upper,my_pets))
print(uppered_pets)

26. Map, filter & reduce
scores = [66, 90, 68, 59, 76, 60, 88, 74, 81, 65]
def is_A_student(score):
return score > 75
over_75 = list(filter(is_A_student, scores))
print(over_75)
scores = [66, 90, 68, 59, 76, 60, 88, 74, 81, 65]
over_75 = list(filter(lambda x: x >75, scores))
print(over_75)

27. Map, filter & reduce
from functools import reduce
numbers = [3, 4, 6, 9, 34, 12]
def custom_sum(first, second):
return first + second
result = reduce(custom_sum, numbers)
print(result)

28. Lists
Deleting elements
Lists and Strings
Map, filter &
reduce
Lecture 25

29. Deleting elements

30. Lists
Deleting elements
Lists and Strings
Map, filter &
reduce
Lecture 25

31. Lists and Strings
To convert from a string to a list of characters, you can
use list.

32. Lists
Deleting elements
Lists and Strings
Map, filter &
reduce
Lecture 25

33. Python Programming
Unit – III (Part IV)
(Lecture 26)
Lists

34. Python Programming
Unit – III (Part IV)
(Lecture 26)
Lists
Aliasing List arguments
Objects and
values

35. Lists
Lecture 23
List is a sequence
Lists are mutable List slices
List methods
List operations
Traversing a list
Deleting elements
Lists and Strings
Map, filter &
reduce
Aliasing
List arguments
Objects and
values
Lecture 25
Lecture 24
Lecture 26

36. Lists
Aliasing
List arguments
Objects and
values
Lecture 26

37. Objects and values
To check whether two variables refer to the same object, you
can use the is operator.

38. Objects and values
To check whether two variables refer to the same object, you
can use the is operator.

39. Lists
Aliasing
List arguments
Objects and
values
Lecture 26

40. Aliasing

41. Lists
Aliasing
List arguments
Objects and
values
Lecture 26

42. List arguments

43. List arguments

44. Lists
Aliasing
List arguments
Objects and
values
Lecture 26