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In Python, a variable is a named container that stores a value. It's like a box with a label on it – the label is the variable name, and the box holds the value.
Key Concepts:
Naming:
Variable names can contain letters (uppercase and lowercase), numbers, and underscores (_).
They must start with a letter or an underscore.
Python is case-sensitive (e.g., myVariable and myvariable are different).
Avoid using reserved keywords (like if, for, while, class, etc.) as variable names.
Choose meaningful names that describe the data they hold (e.g., age, name, total_price).
Assignment:
The = symbol is used to assign a value to a variable.
For example:
age = 30
name = "Alice"
price = 9.99

Data Types:
Python is dynamically typed, meaning you don't explicitly declare the data type of a variable.
The interpreter automatically determines the data type based on the assigned value.
Common data types include:
int: Whole numbers (e.g., 10, -5, 0)
float: Numbers with decimal points (e.g., 3.14, -2.5)
str: Text enclosed in single or double quotes (e.g., "Hello", 'World')
bool: Represents truth values (True or False)
list: An ordered collection of items (e.g., [1, 2, 3], ["apple", "banana"])
dict: A collection of key-value pairs (e.g., {"name": "Alice", "age": 30})
Example:
Declare and assign values to variables
my_name = "Bob"
my_age = 35
is_student = False
my_grades = [90, 85, 92]

Print the values of the variables
print("My name is:", my_name)
print("I am", my_age, "years old.")
print("Am I a student?", is_student)
print("My grades:", my_grades)

Key Points:
Variables are essential for storing and manipulating data in your Python programs.
Choose descriptive variable names for better code readability.
Understand the different data types and how they are used.
I hope this explanation is helpful! Let me know if you have any further questions.


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