Python Lists

Question 1

Methods for Lists

Answer 1

Append

Remove

Question 2

List Method: Append

Answer 2

list.append(Object my_value) - Adds object to the end of the list

Question 3

List Method: Remove

Answer 3

list.remove(Object my_value) - Removes the given object from the list
In a list with multiple instances of a value, only the first instance will be removed.

Question 4

List Method: + (Concatenate)

Answer 4

list3 = list1 + list2 or list3 = list1 + [Object value1, Object value2]
append list2 to list1

Question 5

List Method: [ ] (Square Brackets)

Answer 5

my_list[int index] - Retrieve the object that is referenced by the zero-indexed value
In Python, we can negatively index any element starting at -1 for the last element of the list, -2 for the second-to-last element and so on.

Question 6

Multi-Dimensional List

Answer 6

Useful for representing grids

Question 7

List Method: Count

Answer 7

my_list.count(Obj my_value) - Count the number of occurrences of an element in a list

return: int

time complexity: O(n)

Question 8

List Method: Insert

Answer 8

my_list(int Index, Obj my_value) - Insert an element (my_value) into a specific index of a list.

returns: void

Time Complexity: O(n) unless element is added to end, and then O(1)

Question 9

List Method: Pop

Answer 9

my_list.pop(int index = -1) - Remove an element from a specific index or from the end of a list. The index value is optional.

returns: popped element

Time Complexity: O(n) unless element is removed from the back, and then O(1)

Question 10

List Method: Range (Python specific)

Answer 10

A built in Python function to create a sequence of integers

Question 11

List Method: Len (Python specific)

Answer 11

A built in Python function to get the length of a list

Question 12

List Method: Sort

Answer 12

my_list.sort() - Sort a list
To sort in reverse order -> my_list.sort(reverse=True)

return: void

time complexity: O(n log(n))