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Python > Linkiden > Flashcards

Linkiden Flashcards

1
Q

What is an abstract class

A

An abstract class exists only so that other “concrete” classes can inherit from the abstract class

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2
Q

What happens when you use the build-in function any() on a list?

A

the any() function returns True if all item in the list evaluates to True. Other wise, it returns False.

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3
Q

what data structure does a binary tree degenerate to if it isn’t balanced properly?

A

Linked List

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4
Q

What statement about static methods is true?

A

Static methods server mostly as utility methods or helper methods, since they can’t access or modify a class’s state

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5
Q

What are attributes

A

Attributes are a way to hold data or describe a state for a class or instance of a class

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6
Q

What is the term to describe this code?

count, fruit, price = (2, 'apple', 3.5)
A

Tuple unpacking

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7
Q

What built-in list method would you use to remove items from a list?

A

“.pop()” method

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8
Q

what is one of the most common use of Python’s sys library

A

To capture command-line arguments given at a file’s runtime

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9
Q

what is the runtime of accessing a value in a dictionary by using its key?

A

O(1), also called constant time

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10
Q

What is the correct syntax for defining a class called Game

A

class Game: pass

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11
Q

what is the correct way to write a doctest

A

def sum(a, b):
“””
&raquo_space;> sum(4,3)
7

>>> sum(-4,5)
1
"""
return a + b
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12
Q

What built-in Python data type is commonly used to represent a stack

A

list

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13
Q

What would this expression return?
~~~
college_years = [‘Freshman’, ‘Sophomore’, ‘Junior’, ‘Senior’] return list(enumerate(college_years, 2019))
~~~

A

[(2019, ‘Freshman’), (2020, ‘Sophomore’), (2021, ‘Junior’), (2022, ‘Senior’)]

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14
Q

How doses defaultdict work

A

if you try to access a key in a dictionary that doesn’t exist, defaultdict will create a new key for you instead

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15
Q

What is the correct syntax for defining a class called “Game” ,if it inherits from a parent class called “LogicGame”?

A

class Game(LogicGame): pass

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16
Q

What is the purpose of the “self” keyword when defining or calling instance methods?

A

self refers to the instance whose method was called

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17
Q

Which is NOT a characteristic of Named tuples

A

No import is needed to use named tuples because they are available in the standard library

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18
Q

What is an instance Method?

A

Instance methods can modify the state of an instance or the state of its parent class.

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19
Q

Which choice is the most syntactically correct example of the conditional branching?

A

num_people = 5

if num_people > 10:
print(“There is a lot of people in the pool.”)
elif num_people > 4:
print(“There are some people in the pool.”)
elif num_people > 0:
print(“There are a few people in the pool.”)
else:
print(“There is no one in the pool.”)

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20
Q

Which statement does NOT describe the object-oriented programming concept of encapsulation?

A

It only allows the data to be changed by methods.

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21
Q

What is the purpose of an If/else statement

A

An if/else exectues one chunk of code if the condition is true, but a different chunk of code if the condition is false

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22
Q

what built-in Python data type is commonly used to represent a queue

A

list

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23
Q

What is the correct syntax for instantiating a new object of the type Game

A

my_game = Game()

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24
Q

what does the built-in map() function do?

A

it applies a function to each item in an iterable and returns the value of that function.

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25
Q

If you don’t explicitly return a value from a function, what happens?

A

If the return keyword is absent, the function will return None

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26
Q

What is the purpose of the pass statement in Python?

A

it is a null operation used mainly as a placeholder in functions, classes, etc

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27
Q

What is the term used to describe items that may be passed into a function

A

arguments

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28
Q

Which collection type is used to associate values with unique keys

A

dictionary

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29
Q

when does a for loop stop iterating

A

when it has assessed each item in the iterable it is working on or a break keyword is encountered

30
Q

Assuming the node is in a singly linked list what is the runtime complexity of searching for a specific node within a singly linked list

A

The runtime is O(n) because in the worst case, the node you are searching for is the last node, and every node in teh linked list must be visited.

31
Q

Given the following three list, how would you create a new list that matches the desired output printed below..

fruits = ['Apples', 'Oranges', 'Bananas']
quantities = [5, 3, 4]
prices = [1.50, 2.25, 0.89]

Desired output
[(‘Apples’, 5, 1.50),
(‘Oranges’, 3, 2.25),
(‘Bananas’, 4, 0.89)]

A 
i = 0
output = []
for fruit in fruits:
    temp_qty = quantities[i]
    temp_price = prices[i]
    output.append((fruit, temp_qty, temp_price))
    i += 1
return output
32
Q

What happens when you use the built-in function all() on a list

A

The all() function returns True if all items in the list evaluate to True Otherwise, it returns False

33
Q

What is the correct syntax for calling an instance method on a class named Game?

A

> > > dice = Game()

|&raquo_space;> dice.roll()

34
Q

What is the algorithmic paradigm of quick sort?

A

divide and conquer

35
Q

What is the runtime complexity of the list’s built-in .append() method?

A

O(1), also called constant time

36
Q

What is the key difference between a set and a list?

A

A set is an unordered collection of unique items. A list is an ordered collection of non-unique items

37
Q

What is the definition of abstraction as applied to object-oriented Python?

A

Abstraction means the implementation is hidden from the user, and only the relevant data or information is shown

38
Q

What does this function print?

>>>
def print_alpha_nums(abc_list, num_list):
    for char in abc_list:
        for num in num_list:
            print(char, num)
    return

print_alpha_nums([‘a’, ‘b’, ‘c’], [1, 2, 3])

A 
a 1
a 2
a 3
b 1
b 2
b 3
c 1
c 2
c 3
39
Q

What is the correct syntax for calling an instance method on a class named Game?

A

my_game = Game()

my_game.roll_dice()

40
Q

Correct representation of doctest for function in Python

A 
def sum(a, b):
    """
    >>> a = 1
    >>> b = 2
    >>> sum(a, b)
    3
    """
return a + b
41
Q

Suppose a Game class inherits from two parent classes: BoardGame and LogicGame. Which statement is true about the methods of an object instantiated from the Game class

A

An instance of the Game class will inherit whatever methods the BoardGame and LogicGame classes have

42
Q

What does calling namedtuple on a collection type return

A

a tuple subclass with iterable named fields

43
Q

What symbol(s) do you use to asses equality between two elements

A

==

44
Q

Review the code below. What is the correct syntax for changing the price to 1.5

>>>
fruit_info = {
'fruit': 'apple',
'count': 2,
'price': 3.5
}
A

fruit_info[‘price] = 1.5

45
Q

What value would be returned by this check for equality?

5 != 6

A

True

46
Q

What does a class’s init() method do?

A

The __init__ method is a constructor method that is called automatically whenever a new object is created from a class. It sets the initial state of a new object

47
Q

What is meant by the phrase “space complexity”

A

The amount of space taken up in memory as a function of the input size

48
Q

What is the correct syntax for creating a variable that is bound to a dictionary?

A

fruit_info = {‘fruit’: ‘apple’, ‘count’: 2, ‘price’: 3.5}

49
Q

What is the proper way to write a list comprehension that represents all the keys in the dictionary?
»>
fruits = {‘Apples’: 5, ‘Oranges’: 3, ‘Bananas’: 4}

A

fruit_names = [x for x in fruits.keys()}

50
Q

What is the algorithmic paradigm of quick sort?

A

divide and conquer

51
Q

What is the purpose of the self keyword when defining or calling methods on an instance of an object

A

self refers to the instance whose method was called

52
Q

What statement about a class method is true

A

A class method can modify the state of the class but they can’t directly modify the state of an instance that inherits from that class

53
Q

What does it mean for a function to have linear runtime?

A

The amount of time it takes the function to complete grows linearly ass the input size increases

54
Q

What is the proper way to define a function

A

def get_max_num(list_of_nums): #body of function goes here

55
Q

according to the PEP 8 coding style guidelines, how should constant values be named in Python

A

in all caps with underscores separating words – e.g. MAX_VALUE = 255

56
Q

Describe the functionality of a deque

A

A deque adds items at either or both ends, and remove items at either or both ends

57
Q

What is the correct syntax for creating a variable that is bound to a set?

A

myset = {0, ‘apple’, 3.5}

58
Q

What is the correct syntax for defining an __init__() method that takes no parameters

A 
def \_\_init\_\_(self):
    pass
59
Q

Which statement about the class methods is true

A

A class method can modify the state of the class but it cannot directly modify the state of an instance to hat inherits from that class

60
Q

Which of the following is True about how numeric data would be organized in a binary Search tree

A

For any given Node in a binary Search Tree, the child node to the left is less that the value of the given node and the child node to its right is greater that the given node

61
Q

Why would you use a decorator

A

You use the decorator to alter the functionality of a function without having to modify the functions code

62
Q

When would you use a for loop?

A

When you need to check every element in an iterable of known length

63
Q

What is the most self-descriptive way to define a function that calculates sales tax on a purchase?

A 
def sales_tax(amount):
    '''Calculates the sales tax of a purchase. Takes in a float representing the subtotal as an argument and returns a float representing the sales tax.'''
64
Q

What would happen if you did not alter the state of the element that an algorithm is operating on recursively

A

You would get a RuntimeError: maximum recursion depth exceeded.

65
Q

What is the runtime complexity of searching for an item in a binary search tree?

A

the runtime for searching a binary search tree is generally O(h) where h is the height of the tree

66
Q

Why would you use mixin

A

If you have many classes that all need to have the same functionality you’d use a mixin to define that functionality

67
Q

What is the runtime complexity of adding an item to a stack and removing an item from a stack?

A

Add items to a stack in O(1) or constant and remove items from a stack on O(n) time or linear

68
Q

What does calling namedtuple on a collection type return

A

a tuple subclass with iterable named fields

69
Q

which statement accurately describes how items are added to and removed from a stack

A

a stack adds items to the top and removes items from the top

70
Q

what is the base cases in a recursive function?

A

A base case is the condition that allows the algorithm to stop recursing. it is usually a problem that is small enough to solve directly

Python (2 decks)

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