Python

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Nombre completo

defaultdict forces a dictionary to only accept keys that are of the types specified when you created the defaultdict (such as strings or integers).

defaultdict stores a copy of a dictionary in memory that you can default to if the original gets unintentionally modified.

If you try to read from a defaultdict with a nonexistent key, a new default key-value pair will be created for you instead of throwing a KeyError.

defaultdict will automatically create a dictionary for you that has keys which are the integers 0-10.

Ninguna

You use a mixin to allow a decorator to accept keyword arguments.

You use a mixin to force a function to accept an argument at runtime even if the argument wasn't included in the function's definition.

You use a mixin to make sure that a class's attributes and methods don't interfere with global variables and functions.

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

Ninguna

pp13

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

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

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

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

Ninguna

The any() function returns True if any item in the list evaluates to True. Otherwise, it returns False.

The any() function takes as arguments the list to check inside, and the item to check for. If "any" of the items in the list match the item to check for, the function returns True.

The any() function returns a Boolean value that answers the question "Are there any items in this list?"

The any() function will randomly return any item from the list.

Ninguna

pp94

[0,2,0,0]

{2}

[2]

{0,2}

Ninguna

It creates a path from multiple values in an iterable to a single value.

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

It creates a mapping between two different elements of different iterables.

It converts a complex value type into simpler value types.

Ninguna

There is no benefit to using the with keyword for opening a file in Python.

The with keyword acts like a for loop, and lets you access each line in the file one by one

When you open a file using the with keyword in Python, Python will make sure the file gets closed, even if an exception or error is thrown.

The with keyword lets you choose which application to open the file in.

Ninguna

a generic object class with iterable parameter fields

a tuple subclass with non-iterable parameter fields

a tuple subclass with iterable named fields

a generic object class with non-iterable named fields

Ninguna

pp87

a set of all the multiples of 3 less then 100 excluding 0

a set of all the multiples of 3 less then 100

a list of all the multiples of 3 less then 100

a set of all the number from 0 to 100 multiplied by 3

Ninguna

10.

self refers to the instance whose method was called.

There is no real purpose for the self method; it's just historic computer science jargon that Python keeps to stay consistent with other programming languages.

self refers to the class that was inherited from to create the object using self.

self means that no other arguments are required to be passed into the method.

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11.

def Game.LogicGame(): pass

class Game.LogicGame(): pass

def Game(LogicGame): pass

class Game(LogicGame): pass

Ninguna

12.

pp6

tuple duplication

tuple unpacking

tuple assignment

tuple matching

Ninguna

13.

pp40

1.5 = fruit_info ['price]

my_list [3.5] = 1.5

my_list['price'] == 1.5

fruit_info ['price'] = 1.5

Ninguna

14.

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

The smallest numeric value would go in the top most node. The next highest number would go in its left child node, the the next highest number after that would go in its right child node. This pattern would continue until all numeric values were in their own node.

The top node of the binary search tree would be an arbitrary number. All the nodes to the left of the top node need to be less than the top node's number, but they don't need to ordered in any particular way.

Binary Search Tree cannot be used to organize and search through numeric data, given the complication that arise with very deep trees.

Ninguna

15.

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.

The__init__ method is included to preserve backwards compatibility from Python 3 to Python 2, but no longer needs to be used in Python 3.

The __init__ method initializes any imports you may have included at the top of your file.

The __init__ method makes classes aware of each other if more than one class is defined in a single code file.

Ninguna

16.