Python Programming Introduction: Variables and Assignment statements, Data types

Python is a high-level, interpreted, and dynamically typed programming language known for its simplicity and readability. It was created by Guido van Rossum and first released in 1991. Python supports multiple programming paradigms, including procedural, object-oriented, and functional programming. It is widely used in web development, data science, machine learning, automation, and more. Python’s syntax is concise and easy to understand, making it a preferred language for beginners and professionals alike.

1. Variables and Assignment Statements

Variables in Python

A variable in Python is a name that stores a value. Unlike other programming languages, Python does not require explicit declaration of variables; it automatically assigns the data type based on the assigned value.

Variable Declaration and Assignment

Variables are assigned using the = operator. Example:

x = 10 # Integer
name = “John” # String
pi = 3.14 # Float
is_valid = True # Boolean

• Variables must start with a letter or underscore (_) but cannot start with a digit.

• They cannot use Python reserved keywords (e.g., if, while, def).

• Python is case-sensitive, meaning var and Var are different.

2. Data Types in Python

Python has several built-in data types categorized into:

A. Numeric Data Types

1. Integer (int) → Whole numbers

a = 100 # Example of an integer

2. Floating-point (float) → Decimal numbers

b = 10.5 # Example of a float

3. Complex (complex) → Numbers with real and imaginary parts

c = 3 + 5j # Complex number

B. Sequence Data Types

1. String (str) → Sequence of characters

text = “Python” # String example

2. List (list) → Ordered, mutable collection

numbers = [1, 2, 3, 4, 5] # List example

3. Tuple (tuple) → Ordered, immutable collection

coordinates = (10, 20) # Tuple example

C. Set and Dictionary Data Types

1. Set (set) → Unordered collection of unique items

unique_numbers = {1, 2, 3, 4} # Set example

2. Dictionary (dict) → Key-value pairs

student = {“name”: “John”, “age”: 25} # Dictionary example

D. Boolean Data Type

1. Boolean (bool) → Represents True or False

status = True # Boolean example