What is the difference between a list and a dictionary in Python?

The main difference is that lists are indexed collections of items, whereas dictionaries are collections of key-value pairs.

Lists can only contain numbers, while dictionaries can contain any data type.

Dictionaries are ordered collections, while lists are unordered.

Lists use keys to access items, whereas dictionaries use indices.

How do you add a new key-value pair to a dictionary?

Use dictionary_name[new_key] = new_value.

dictionary_name.append(new_key: new_value)

dictionary_name.insert(new_key, new_value)

dictionary_name.add(new_key, new_value)

What method would you use to remove an item from a list?

Use the 'remove()' or 'pop()' method.

Explain how to iterate over a dictionary in Python.

Use 'for key in my_dict:' to iterate over keys, 'for value in my_dict.values():' for values, and 'for key, value in my_dict.items():' for key-value pairs.

Use 'for key, value in my_dict.keys():' for key-value pairs.

Use 'for my_dict in keys():' to iterate over keys.

Use 'for my_dict.items() in value:' for values.

What is a list comprehension and provide an example?

Example: squares = [x**2 for x in range(10)] results in [0, 1, 4, 9, 16, 25, 36, 49, 64, 81].

squares = [x + 1 for x in range(10)] results in [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

squares = [x**3 for x in range(5)] results in [0, 1, 8, 27, 64]

squares = [x for x in range(10)] results in [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

How do you check if a key exists in a dictionary?

Use 'key in dictionary' to check for key existence.

Use 'dictionary.key' to access the value directly.

Use 'key.exists()' method to verify key presence.

Check if 'dictionary.get(key)' returns None.

How can you merge two dictionaries in Python?

dict1.update(dict2) or merged_dict = dict1 | dict2

What is the difference between the append() and extend() methods in lists?

append() adds one element; extend() adds multiple elements.

append() and extend() are the same and do not differ.

append() removes an element; extend() replaces an element.

append() adds multiple elements; extend() adds one element.

How do you sort a list in Python?

Use list.sort() or sorted(list) to sort a list in Python.

Use list.reverse() to sort a list in Python.

Use list.append() to sort a list in Python.

Use list.remove() to sort a list in Python.

What is the purpose of the pop() method in a list?

The purpose of the pop() method in a list is to remove and return an item from the list.

The pop() method sorts the items in the list in ascending order.

The pop() method returns the first item in the list without removing it.

The pop() method adds an item to the end of the list.

Explain the use of the 'in' keyword with lists and dictionaries.

The 'in' keyword checks for membership in lists and keys in dictionaries.

The 'in' keyword checks for the length of lists and values in dictionaries.

The 'in' keyword is used to sort lists and dictionaries.

The 'in' keyword only works with strings and tuples.

How can you create a copy of a list in Python?

new_list = original_list.copy()

new_list = original_list.extend([])

What is the purpose of the 'self' parameter in Python class methods?

'self' refers to the instance of the class and is used to access variables that belong to the class.

'self' is a keyword that allows access to global variables.

'self' is used to define static methods in a class.

'self' is a placeholder for the class name itself.

How can you remove duplicates from a list in Python?

Use the 'set()' function to convert the list to a set and back to a list.

Use list comprehension to filter out duplicates.

Use the 'unique()' function from the numpy library.

Use the 'remove()' method in a loop.

What is the significance of the 'super()' function in Python?

'super()' is used to call methods from a parent class in a child class.

'super()' is used to create a new instance of a class.

'super()' is used to define private methods in a class.

'super()' is a method for deleting class attributes.

How do you check if a value exists in a list?

Use 'value in list_name' to check for existence.

Use 'list_name.exists(value)' to check for existence.

Use 'list_name.index(value)' to check for existence.

Use 'list_name.contains(value)' to check for existence.

What is the purpose of the 'len()' function in Python?

'len()' returns the number of items in an object.

'len()' is a method for sorting lists.

'len()' is used to convert a string to a list.

'len()' checks if an object is empty.

How do you access the first element of a tuple in Python?

Use tuple_name[0] to access the first element.

Use tuple_name.first() to access the first element.

Use tuple_name[1] to access the first element.

Use tuple_name.get(0) to access the first element.

What is the difference between '==' and 'is' in Python?

'==' checks for value equality, while 'is' checks for identity (same object).

'==' is used for strings, while 'is' is used for numbers.

'==' checks for identity, while 'is' checks for value equality.

Both are the same and can be used interchangeably.

What is the purpose of the 'if' statement in Python?

To execute code conditionally based on a boolean expression.

To create a loop that iterates over a list.

To import modules into a Python script.

To define a function in Python.

How do you write a for loop in Python?

for item in sequence: # code to execute

How can you import a module in Python?

Use the 'import' statement followed by the module name.

Modules can be imported by typing 'include' followed by the module name.

Use the 'require' statement to load the module.

Import modules by using the 'load' command.

What is the difference between a function and a method in Python?

A function is a standalone block of code, while a method is a function associated with an object.

A method is always a built-in function, while a function is user-defined.

Functions and methods are the same and can be used interchangeably in Python.

A function can only be used within a class, while a method can be used anywhere.

What is inheritance in Python?

Inheritance in Python is a mechanism where a new class derives properties and behavior from an existing class.

Inheritance allows a class to inherit only methods, not properties.

Inheritance is a way to create multiple classes with no relationship.

Inheritance in Python is a method to delete classes from memory.

What is the difference between a list and a tuple in Python?

The main difference is that lists are mutable and tuples are immutable.

Lists are defined using parentheses, while tuples are defined using square brackets.

Tuples are mutable and can be changed after creation, while lists are not.

Lists can contain only numbers, while tuples can contain any data type.

What is the purpose of the 'return' statement in a function?

To return a value from a function.

To print output to the console.

How do you check if a number is even using an if statement?

if (number % 2 == 0) { // number is even }

if (number == 0) { // number is even }

if (number / 2 == 1) { // number is odd }

if (number % 2 != 0) { // number is even }

What is the purpose of indentation in Python?

To define code blocks and control flow.

To increase the speed of the program.

What is the purpose of a function in Python?

The purpose of a function in Python is to encapsulate code for reuse and improve code organization.

To execute code only once during a program's lifetime

What are the basic data types in Python?

string, number, boolean, object

Explain the use of 'for' loops in Python.

'for' loops in Python are used to iterate over sequences or iterables, executing a block of code for each element.

'for' loops can only iterate over numbers in Python.

'for' loops are used to create classes in Python.

'for' loops are used to define functions in Python.

What is the difference between a list and a tuple in Python?

A list is defined using square brackets, while a tuple is defined using parentheses.

A list is immutable, while a tuple is mutable.

Both lists and tuples are mutable data types.

Both lists and tuples are defined using square brackets.

Python Programming Concepts

Authored by Loudel Manaloto

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MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is a class in Object-Oriented Programming?

A class is a type of variable in programming.

A class is a blueprint for creating objects in Object-Oriented Programming.

A class is a function that executes code.

A class is a method for data storage.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

Explain the concept of inheritance in Python.

Inheritance allows a class to create new methods only.

Inheritance is a method to combine two classes into one.

Inheritance in Python is a mechanism where a class can inherit attributes and methods from another class, enabling code reuse and a hierarchical class structure.

Inheritance is a way to delete attributes from a class.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is the purpose of the init method in a class?

To create a new class from an existing one.

To define a class's methods and functions.

To initialize an object's attributes when a class instance is created.

To delete an object's attributes when a class instance is destroyed.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

How do you create an instance of a class in Python?

instance = new ClassName()

create ClassName() instance

ClassName.instance()

instance = ClassName()

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is polymorphism in the context of OOP?

Polymorphism refers to the ability of a class to inherit properties from multiple parent classes.

Polymorphism is the process of combining multiple classes into one.

Polymorphism is the technique of creating multiple instances of the same class.

Polymorphism is the ability of different classes to be treated as instances of the same class through a common interface.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

Define encapsulation and its importance in OOP.

Encapsulation is a method for increasing the speed of code execution.

Encapsulation is a principle in OOP that restricts access to an object's internal state, enhancing security and maintainability.

Encapsulation is only relevant in procedural programming.

Encapsulation allows unlimited access to an object's internal state.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

How can you create a private variable in a Python class?

Use two underscores before the variable name, e.g., __private_var.

Use the keyword 'private' before the variable name.

Declare the variable outside the class definition.

Use a single underscore before the variable name, e.g., _private_var.

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Python Programming Concepts

What is a class in Object-Oriented Programming?

Explain the concept of inheritance in Python.

What is the purpose of the __init__ method in a class?

How do you create an instance of a class in Python?

What is polymorphism in the context of OOP?

Define encapsulation and its importance in OOP.

How can you create a private variable in a Python class?

What is the difference between a list and a dictionary in Python?

How do you add a new key-value pair to a dictionary?

What method would you use to remove an item from a list?

Access all questions and much more by creating a free account

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What is the purpose of the init method in a class?