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Variables are a fundamental concept in Python, allowing you to store and refer to data by name. A variable acts as a label for a value in memory. In Python, you create a variable by assigning it a value using the equals sign (=). When naming variables, follow these rules:

Variable names must start with a letter or underscore;
Names can contain letters, numbers, and underscores;
Variable names are case-sensitive;
Avoid using Python reserved keywords as variable names.

Assigning a value to a variable is straightforward: write the variable name, then =, then the value you want to store.


              12345678910111213
            
# Assigning values to variables of different types

# Integer variable
age = 25

# Float variable
temperature = 36.6

# String variable
greeting = "Hello, Python!"

# Boolean variable
is_active = True

Python provides several built-in data types to represent different kinds of information. The most common are:

int for whole numbers, such as 25;
float for decimal numbers, such as 36.6;
str for text, such as "Hello, Python!";
bool for logical values, either True or False.

Each variable you assign is automatically given a data type based on the value you provide. The examples above show how to create variables with these types.


              123456
            
# Checking the data types of variables using type()

print(type(age))         # Output: <class 'int'>
print(type(temperature)) # Output: <class 'float'>
print(type(greeting))    # Output: <class 'str'>
print(type(is_active))   # Output: <class 'bool'>

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Variables and Data Types

Variable names must start with a letter or underscore;
Names can contain letters, numbers, and underscores;
Variable names are case-sensitive;
Avoid using Python reserved keywords as variable names.