PYTHON3_3.14 > Lists > Flashcards

Lists Flashcards

(46 cards)

Study These Flashcards
1
Q

List are:

A
  • A list is a collection of items in a particular order
  • Ordered sequences that can hold a variety of object types.
  • [] Brackets and commas to separate objects in list [1,2,3,4,5]
  • List support indexing and slicing
  • List can be nested and also have a variety of useful methods that ce called off of them.
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2
Q

List examples:

A

my_list = [1,2,3,4]

my_list2 = [‘STRING’,100,23.3]

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3
Q

Cancatinate 2 list

mylist = [‘one’,’two’,’three’]

another_list = [‘apple’,’pie’,’cherry’]

A

mylist + another_list

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4
Q

Combine two list

mylist = [‘one’,’two’,’three’]

another_list = [‘apple’,’pie’,’cherry’]

A

mynewlist = mylist + another_list

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5
Q

Change the first string in this list to “One for all’

new_list = [‘one’, ‘two’, ‘three’, ‘four’, ‘five’]

A

new_list[0] = ‘One for all’

would change it to

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’]

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6
Q

Add an element to the end of a list:

A

new_list.

new_list.append(‘six’)

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

NOTE:This affects the list in place

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7
Q

Remove the last element from a list:

A

Done using pop

new_list.pop()

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

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8
Q

Remove an element from the 3 position

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

A

new_list.pop(3)

new_list = [‘One for all’, ‘two’, ‘three’, ‘five’, ‘six’]

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9
Q

Sort list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

A

Call the sort method

new_list.sort()

NOTE:This sorts the list in place

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10
Q

Reassign this list but first Sort list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

A

new_list.sort()

my_sorted_list = new_list

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11
Q

Reverse this list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

A
  • Call the reverse method
  • num_list.reverse()

[3,8,1,4]

  • new_list.reverse()

[‘c’, ‘b’, ‘e’, ‘a’]

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12
Q

How do I index a nested list? For example if I want to grab 2 from [1,1,[1,2]]?

A

You would just add another set of brackets for indexing the nested list, for example:

my_list[2][1]

NOTE: List follow the same numbering sequence as strings.

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13
Q

If lst=[0,1,2] what is the result of lst.pop()

A

2

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14
Q

Lists can have multiple object types.

A

True

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15
Q

If lst=[‘a’,’b’,’c’] What is the result of lst[1:]?

A

[‘b’,’c’]

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16
Q

Are list mutable?

A
  • Yes, Python lists are mutable
  • which means you can modify their content (add, remove, or change elements) after creation.
    *
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17
Q

What are the immutable data types in Python?

A
  • Strings
  • Tuples
  • Numbers (integers, floats)
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18
Q

What are the things inside a list called?

A

Each item is called an Element

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19
Q

Insert an element into a list

Study These Flashcards
A
  • You can add a new element at any position in your list by using the insert() method.
  • You do this by specifying the index of the new element and the value of the new item:
motorcycles = ['honda', 'yamaha', 'suzuki']

motorcycles.insert(0, 'ducati')
print(motorcycles)
['ducati', 'honda', 'yamaha', 'suzuki']
20
Q

What are the 2 things need to Insert an element into a list?

Study These Flashcards
A
  • Index where it is going
  • New element
motorcycle.insert(3, "harley davidson")
print(motorcycle)
['suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
motorcycle.insert(0, "triumph")
print(motorcycle)
['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
21
Q

How do remove an element from a list?

Study These Flashcards
A

Delete an element permanently a list

  • **del **Statement (This is not a method)
del motorcycle[2]
motorcycle = ['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']

print(motorcycle)
['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
del motorcycle[2]
print(motorcycle)
['triumph', 'suzuki', 'kawasiki', 'harley davidson', 'honda']
  • ‘yamaha’ is now missing
22
Q

How do remove the last item from a list for later use?

Study These Flashcards
A
  • pop() method
motorcycle = ['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
print(motorcycle)
['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
popped_motorcycle = motorcycle.pop()
print(f"The last motorcyle I owneed was a {popped_motorcycle.title()}.")
The last motorcyle I owneed was a Honda.
print(popped_motorcycle)
honda
23
Q

How do remove an item from anywhere in list for later use?

Study These Flashcards
A
  • pop() method
# Remove an element for later use in a list from any where in the list
motorcycle = ['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']
print(motorcycle)
['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda']

popped_motorcycle = motorcycle.pop(3)
print(f"The last motorcyle I owneed was a {popped_motorcycle.title()}.")
The last motorcyle I owneed was a Kawasiki.
print(popped_motorcycle)
kawasiki
24
Q

What is the difference between append() and insert()?

Study These Flashcards
A
  • **appened() **will add an item to the end of a list
  • insert() will add an element anywhere in a list
25
If you use **remove()**, how many times will it try to remove an item?
* The **remove() **method deletes only the first occurrence of the value you specify. * If there’s a possibility the value appears more than once in the list, you’ll need to use a loop to make sure all occurrences of the value are removed.
26
Remove an item from a list using the value?
* **remove()** method ``` # Remove an element by vaule from a list motorcycle = ['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda'] print(motorcycle) motorcycle.remove('yamaha') ['triumph', 'suzuki', 'yamaha', 'kawasiki', 'harley davidson', 'honda'] # print(f"The last motorcyle I owneed was a {popped_motorcycle.title()}.") print(motorcycle) ['triumph', 'suzuki', 'kawasiki', 'harley davidson', 'honda'] ``` * 'yamaha' is now missing
27
What is sort()?
* **sort() **is a method * The **sort()** method changes the order of the list permanently. * You can also sort this list in reverse-alphabetical order by passing the argument reverse=True to the sort() method.
28
How do you sort, a **sort()** list in reverse-alphabetical order?
* You can also sort this list in reverse-alphabetical order by passing the argument **reverse=True** to the **sort()** method. ``` cars = ['bmw', 'audi', 'toyota', 'subaru'] cars.sort() print(cars) ['audi', 'bmw', 'subaru', 'toyota'] cars.sort(reverse=True) print(cars) ['toyota', 'subaru', 'bmw', 'audi'] ```
29
How do you sort a list temporarily?
# print("\nHere is the sorted list:") * **sorted() ** function * Lets you display your list in a particular order, but doesn’t affect the actual order of the list. ``` cars = ['bmw', 'audi', 'toyota', 'subaru'] print(cars) ['bmw', 'audi', 'toyota', 'subaru'] print(sorted(cars)) ['audi', 'bmw', 'subaru', 'toyota'] # print("\nHere is the original list again:") print(cars) ['bmw', 'audi', 'toyota', 'subaru'] ```
30
What is the difference between **sort()** and **sorted()**?
1. **sort()** is a method, meaning it is attahced to the variable 2. sort() is permanent change to a list ``` cars = ['bmw', 'audi', 'toyota', 'subaru'] cars.sort() print(cars) ['audi', 'bmw', 'subaru', 'toyota'] ``` 1. **sorted()** is a Function ``` # Original list cars = ['bmw', 'audi', 'toyota', 'subaru'] print(sorted(cars)) # Here is the sorted list: ['audi', 'bmw', 'subaru', 'toyota'] # Here is the original list again: ['bmw', 'audi', 'toyota', 'subaru'] ```
31
Copy a list
* First, we make a list of the foods we like called my_foods. * Then we make a new list called friend_foods. * We make a copy of my_foods by asking for a slice of my_foods without specifying any indices ❶, and assign the copy to friend_foods. * When we print each list, we see that they both contain the same foods: ``` my_foods = ['pizza', 'falafel', 'carrot cake'] ❶ friend_foods = my_foods[:] print("My favorite foods are:") print(my_foods) My favorite foods are: ['pizza', 'falafel', 'carrot cake'] print("\nMy friend's favorite foods are:") print(friend_foods) My friend's favorite foods are: ['pizza', 'falafel', 'carrot cake'] ```
32
33
What is a **list** in programming?
A container type that contains elements ## Footnote Lists are fundamental data structures used to store collections of items.
34
True or false: A list is a **sequence type** where elements are ordered sequentially.
TRUE ## Footnote This means that the order of elements in a list is preserved.
35
What does it mean that lists are **mutable**?
Can add, replace, or remove elements ## Footnote This allows for dynamic modification of the list's contents.
36
What does it mean that lists have **unbounded growth**?
Can add as many elements as we want ## Footnote There is no fixed limit to the number of elements in a list.
37
True or false: Lists are **objects** in programming.
TRUE ## Footnote Lists are treated as objects, allowing them to have properties and methods.
38
How are **elements** in a list organized?
They are indexed ## Footnote Each element in a list can be accessed using its index position.
39
What do we mean when we say lists have **state**?
The elements contained in the list ## Footnote The state of a list reflects its current contents.
40
What functionality do lists have?
* Add element * Remove element * Replace element ## Footnote These operations allow for effective management of list contents.
41
What are **lists** in programming?
Sequence types that are indexable ## Footnote Lists maintain a sequential order and can be accessed by their index.
42
Given the list **l = [10, 20, 30, 40, 50]**, what is the value at index **0**?
l[0] 10 ## Footnote Indexing starts at 0, so l[0] refers to the first element.
43
What will happen if you try to access a list by an index greater than its last index?
It will cause an **IndexError** ## Footnote Accessing an index that does not exist in the list results in an exception.
44
In the list **l = [10, 20, 30, 40, 50]**, what is the value at index **2**?
l[2] 30 ## Footnote The value at index 2 is the third element in the list.
45
How do you reference an element in a list?
By its **index** ## Footnote For example, l[i] accesses the element at index i.
46
What is the **length** of the list **l = [10, 20, 30, 40, 50]**?
len(l) 5 ## Footnote The length of a list is the total number of elements it contains.
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