🐍 Python

Question 1

What is Python?

Answer 1

It is a programming language known for its simplicity and readability.

Question 2

Where is Python widely used in?

Answer 2

It is widely used in various fields such as web development, data science, artificial intelligence, and more.

Question 3

What are the key features in Python? (5)

Answer 3

• Simple and easy-to-read syntax
• Dynamic typing
• Automatic memory management (garbage collection)
• Extensive standard library
• Support for multiple programming paradigms (procedural, object-oriented, functional)

Question 4

What are the (8) different data types in Python?

Answer 4

1. Integers (int)
2. Floating-point numbers (float)
3. Strings (str)
4. Lists (list)
5. Tuples (tuple)
6. Dictionaries (dict)
7. Sets (set)
8. Booleans (bool)

Question 5

define the data type Integers (int)

Answer 5

Whole numbers without any decimal point

eg, -5, 10, 1000

Question 6

define the data type Floating-point numbers (float)

Answer 6

Numbers with a decimal point or in exponential form

eg. 3.14, -0.001, 2.5e-4

Question 7

define the data type Strings (str)

Answer 7

Ordered sequence of characters enclosed in single (‘’) or double (“”) quotes

eg. “Hello!”, “1234”

Question 8

define the data type Lists (list)

Answer 8

• Ordered collection of items, mutable and can contain elements of different data types
• made in square brackets []

eg. [1, 2, 3], [‘apple’, ‘banana’, ‘orange’], [1, ‘two’, 3.0]

Question 9

define the data type Tuples (tuple)

Answer 9

• Ordered collection of items, can’t change and can contain elements of different data types.
• made with round brackets ()

eg. (1, 2, 3), (‘a’, ‘b’, ‘c’), (1, ‘two’, 3.0)

Question 10

define the data type Dictionaries (dict)

Answer 10

• Unordered collection of key-value pairs, mutable and indexed by unique keys
• uses curly brackets {}

eg. {‘name’: ‘John’, ‘age’: 30}, {‘fruit’: ‘apple’, ‘color’: ‘red’}

Question 11

define the data type Set (set)

Answer 11

• Unordered collection of unique elements, mutable and does not allow duplicate values
• Uses curly brackets {}

eg. {1, 2, 3}, {‘a’, ‘b’, ‘c’}, {True, False}

Question 12

define the data type Booleans (bool)

Answer 12

Logical data type representing truth values True or False

eg. True, False

Question 13

when would you use the data type of Integers in your code?

Answer 13

when dealing with whole numbers or counting items that cannot be divided into smaller parts

eg. counting the number of students in a class

Question 14

when would one use the data type Floating-point numbers (float) in their code?

Answer 14

to deal with quantities that can have fractional parts or require precise calculations

eg. Calculating the average temperature of a city over a period of time.

Question 15

when would one use the data type Stings (str) in their code?

Answer 15

when working with text data, such as user input, file contents, or messages displayed to the user

eg. Storing a user’s name or a sentence entered by the user

Question 16

when would one use Lists (list) in their code?

Answer 16

Use lists to store collections of items that need to be ordered and can be modified

eg. Storing a list of tasks to be completed, a list of student grades

Question 17

When would one use the data type Tuples (tuple) in their code?

Answer 17

to store collections of items that should not be changed after creation, such as fixed data or function arguments

eg. Storing coordinates (latitude, longitude) of a location

Question 18

when would one use the data type Dictionaries (dict) in their code?

Answer 18

to store data in key-value pairs when quick look-up by a unique identifier (key) is needed

eg. Storing user information using their username as the key,

Question 19

when would one use the data type Sets (set) in their code?

Answer 19

when dealing with unique elements or performing mathematical set operations like union, intersection, and difference

eg. Storing unique user IDs to see who liked a post

Question 20

When would one use the data type of Booleans (bool) in their code?

Answer 20

to represent truth values in logical operations or to control the flow of your program based on conditions

eg. Checking if a user is logged in (True or False)

Question 21

What is a Python module?

Answer 21

• a file containing Python code, typically containing functions, classes, and variables. Modules allow for code organization, reusability, and modularity.
  ** They can be imported into other Python scripts using the import statement.

Question 22

What is the difference between ‘==’ and ‘is’ in Python?

Answer 22

The ‘==’ operator checks for equality of values, while the ‘is’ operator checks for identity, i.e., whether two variables refer to the same object in memory.

Question 23

what are the three conditional statements?

Answer 23

If, elif and else

Question 24

define these contional statements

Answer 24

used to execute different blocks of code based on specified conditions

eg. Checking if a number is positive, negative, or zero.

Question 25

what are the two types of loops?

Answer 25

1. For loop 2. While Loop

Question 26

why would one use loops?

Answer 26

to execute a block of code repeatedly until a certain condition is met

Question 27

what does a 'for' loop do?

Answer 27

* Iterating over elements in a list, tuple, or string. * Performing a specific number of iterations known beforehand.

Question 28

what does a 'while' loop do?

Answer 28

* Iterating until a certain condition is met, such as reaching a specific value. * Iterating based on user input or external conditions where the number of iterations is uncertain.

Question 29

what does it mean to iterate? (define the verb 'itering')

Answer 29

he process of going through each item in a collection (like a list, tuple, or string) and performing some action with each item ## Footnote eg. you have a list of numbers [1, 2, 3, 4, 5], iterating over this list means going through each number one by one and performing some operation, such as printing the number or adding it to a sum.

Question 30

what are functions and why use them?

Answer 30

* to group reusable code and perform specific tasks. * Functions can take input parameters and return output values. | eg. Defining a function to calculate the factorial of a number.