Python

Question 1

What are the 4 major data types?

Answer 1

Integer, Float, String, Boolean

Question 2

What is an integer?
What category does it fall into?
What is it’s command

Answer 2

Real Number
Data Types
int( )

Question 3

What is an float?
What category does it fall into?
What is it’s command?

Answer 3

Represents a floatingnumber (1.2, 2.0, 2.1)
Data Type
float( )

Question 4

What is an boolean?
What category does it fall into?
What is it’s command?

Answer 4

Represents True (1) or False (0)
Data Type
bool( )

Question 5

What is a string?
What category does it fall into?
What is it’s command?

Answer 5

Represents a sequence of characters enclosed in single quotes (‘’) or double quotes (“”).
Data Type
str( )

Question 6

What is a list?
What category does it fall into?

Answer 6

Data Structure representing an ordered collection of items enclosed in square brackets ([]). Each element in a list is assigned a unique index, starting from 0 for the first element. The items can be of any data type and are mutable, meaning their values can be changed.

fruits = [“apple”, “banana”, “orange”]

Question 7

What is a tuple?
What category does it fall into?

Answer 7

Data structure representing an ordered collection of items enclosed in parentheses (()). Each element in a tuple is assigned a unique index, starting from 0 for the first element. The items can be of any data type. Tuples are immutable, meaning their values cannot be changed once defined.

coordinates = (10.0, 20.0)

Question 8

What is a set?
What category does it fall into?

Answer 8

Data structure representing an unordered collection of unique items enclosed in curly braces ({}). Sets are mutable, meaning their values can be changed.

numbers = {1, 2, 3, 4, 5}

Question 9

What is a dictionary?
What category does it fall into?

Answer 9

Data structure representing a collection of key-value pairs enclosed in curly braces ({}). Each key-value pair is separated by a colon (:), and the keys are unique. Dictionaries are mutable, meaning their values can be changed.

person = {“name”: “John”, “age”: 30}

Question 10

How would you write a list called numbers including numbers 1 to 5?

Answer 10

numbers = [1, 2, 3, 4, 5]

Question 11

How would you code a tuple called coordinates with values of 10 and 20?

Answer 11

coordinates = (10.0, 20.0)

Question 12

How would you code a set called fruits with values Apple, banana, and orange?

Answer 12

fruits = {“apple”, “banana”, “orange”}

Question 13

How would you code a dictionary entry called person named John, age 30?

Answer 13

person = {“name”: “John”, “age”: 30}

Question 14

What is a data type?

Answer 14

data types define the type of value that a variable can hold

Question 15

What is casting?

Answer 15

Casting in Python refers to the process of changing the data type of a value. It allows you to convert a value from one type to another.

Question 16

What is a Modulo?
How is it written?
What does it do?

Answer 16

Modulo (%): Returns the remainder of the division.

result = 10 % 3
print(result) # Output: 1

Question 17

What is floor division?
How is it written?

Answer 17

Returns the quotient of the division, rounded down to the nearest integer.

result = 10 // 3
print(result) # Output: 3

Question 18

What are variables?
What are they used for?

Answer 18

Variables in Python are used to store and manipulate data. A variable is a named location in the computer’s memory where you can store a value.

Question 19

What does mutable mean?

Answer 19

Means the values can be changed.

Question 20

What does immutable mean?

Answer 20

Means the values cannot be changed once defined.

Question 21

How do you access an item in a list or tuple?
Access Apple in the following list?

fruits = [“apple”, “banana”, “orange”]

Answer 21

You can access individual elements in a list by their index. Remember that the index starts from 0. For example:

fruits = [“apple”, “banana”, “orange”]
print(fruits[0]) # Output: “apple”
print(fruits[1]) # Output: “banana”

Question 22

How do you add items to a list or tuple?
What is the code to add grapes to this list?

fruits = [“apple”, “banana”, “orange”]

Answer 22

You can add new elements to the end of a list or tuple using the append() method.

fruits = [“apple”, “banana”, “orange”]
fruits.append(“grape”)
print(fruits) # Output: [“apple”, “banana”, “orange”, “grape”]

Question 23

How do you modify the value of a list or tuple element?
What is the code to change banana to kiwi?

fruits = [“apple”, “banana”, “orange”]

Answer 23

You can change the value of an element in a list or tuple by assigning a new value to its index.

fruits = [“apple”, “banana”, “orange”]
fruits[1] = “kiwi”
print(fruits) # Output: [“apple”, “kiwi”, “orange”]

Question 24

What is it called when you extract a portion of a list or tuple?
Extract banana, orange, and kiwi from below:

fruits = [“apple”, “banana”, “orange”, “kiwi”, “grape”]

Answer 24

You can extract a portion of a list using slicing. Slicing allows you to specify a range of indices to extract elements.

fruits = [“apple”, “banana”, “orange”, “kiwi”, “grape”]
sliced_fruits = fruits[1:4]
print(sliced_fruits) # Output: [“banana”, “orange”, “kiwi”]

Question 25

How to you find out the length of a list?

Answer 25

You can determine the length of a list (i.e., the number of elements) using the len() function. fruits = ["apple", "banana", "orange"] length = len(fruits) print(length) # Output: 3

Question 26

What is unpacking a tuple? What is it useful for? How would you code it?

Answer 26

Unpacking: You can unpack the values of a tuple into separate variables. This is useful when you want to assign each element of a tuple to a different variable. coordinates = (10.0, 20.0) x, y = coordinates print(x) # Output: 10.0 print(y) # Output: 20.0

Question 27

How do you access/print values in a dictionary? How would you code it?

Answer 27

Accessing Values: You can access the value associated with a specific key in a dictionary by using the key as an index. person = {"name": "John", "age": 30, "city": "New York"} print(person["name"]) # Output: "John" print(person["age"]) # Output: 30

Question 28

How do you modify values of a dictionary? How would you code it?

Answer 28

Modifying Values: You can change the value associated with a specific key in a dictionary by assigning a new value to it. person = {"name": "John", "age": 30, "city": "New York"} person["age"] = 35 print(person["age"]) # Output: 35

Question 29

How would you add a new key value pair of a dictionary? Code city / New York into list person?

Answer 29

Adding New Key-Value Pairs: You can add new key-value pairs to a dictionary by using a new key as an index and assigning a value to it. person = {"name": "John", "age": 30} person["city"] = "New York" print(person) # Output: {"name": "John", "age": 30, "city": "New York"}

Question 30

How do you delete a key-value pair from a dictionary? How do you code deleting

Answer 30

Removing Key-Value Pairs: You can remove a specific key-value pair from a dictionary using the del keyword. person = {"name": "John", "age": 30, "city": "New York"} del person["age"] print(person) # Output: {"name": "John", "city": "New York"}

Question 31

How do you check if a key exists in a dictionary? What would the output be presented?

Answer 31

Checking Key Existence: You can check if a specific key exists in a dictionary using the in keyword. person = {"name": "John", "age": 30, "city": "New York"} print("name" in person) # Output: True print("country" in person) # Output: False

Question 32

How do you get keys and/or values from a dictionary?

Answer 32

Getting Keys and Values: You can retrieve all the keys or values from a dictionary using the keys() and values() methods, respectively. person = {"name": "John", "age": 30, "city": "New York"} keys = person.keys() values = person.values() print(keys) # Output: dict_keys(["name", "age", "city"]) print(values) # Output: dict_values(["John", 30, "New York"])

Question 33

How do you add elements into a set? How would you code adding grapes to a set called fruits?

Answer 33

Adding Elements: You can add new elements to a set using the add() method. fruits = {"apple", "banana", "orange"} fruits.add("grape") print(fruits) # Output: {"apple", "banana", "orange", "grape"}

Question 34

How do you remove elements from a set?

Answer 34

Removing Elements: You can remove elements from a set using the remove() method. fruits = {"apple", "banana", "orange"} fruits.remove("banana") print(fruits) # Output: {"apple", "orange"}

Question 35

How do you check existence of an element in a set? How would it show in output?

Answer 35

Checking Existence: You can check if an element exists in a set using the in keyword. fruits = {"apple", "banana", "orange"} print("apple" in fruits) # Output: True print("grape" in fruits) # Output: False

Question 36

How do you combine two sets? Set1 and Set2

Answer 36

set1 = {1, 2, 3} set2 = {2, 3, 4} # Union union_set = set1.union(set2) print(union_set) # Output: {1, 2, 3, 4}

Question 37

How do you show the difference in two sets, set1 and set2?

Answer 37

set1 = {1, 2, 3} set2 = {2, 3, 4} difference_set = set1.difference(set2) print(difference_set) # Output: {1}

Question 38

How do you see the common items of a set, set1 and set2?

Answer 38

set1 = {1, 2, 3} set2 = {2, 3, 4} intersection_set = set1.intersection(set2) print(intersection_set) # Output: {2, 3}

Question 39

How do you find out the length of a set?

Answer 39

Length: You can determine the number of elements in a set using the len() function. fruits = {"apple", "banana", "orange"} length = len(fruits) print(length) # Output: 3

Question 40

What are loops? What are the two main types?

Answer 40

Loops in Python are used to repeatedly execute a block of code until a certain condition is met. They allow you to automate repetitive tasks and iterate over collections of data. for loop while loop

Question 41

What is a “for” loop?

Answer 41

The for loop is used to iterate over a sequence (such as a list, tuple, or string) or other iterable objects. It executes a block of code for each item in the sequence. for i in range(5): print(i) #output 0 1 2 3 4

Question 42

What is a while loop?

Answer 42

The while loop is used to repeatedly execute a block of code as long as a certain condition is true. It continues executing the loop as long as the condition remains true. count = 0 while count < 5: print(count) count += 1 #output 0 1 2 3 4

Question 43

What is a function? How do you define a function?

Answer 43

Define a function in Python, you can use the def keyword followed by the function name and a pair of parentheses. You can also specify parameters inside the parentheses if the function takes any inputs. def calculate_area(length, width): area = length * width return area result = calculate_area(5, 3) print(result) # Output: 15

Question 44

How do you sort?

Answer 44

The sort() method is used to sort a list in-place, meaning it modifies the original list. numbers = [3, 1, 4, 2, 5] numbers.sort() print(numbers) # Output: [1, 2, 3, 4, 5]