Variables and Data Types

Variables in Python

A variable is a named container that stores a value. In Python, you create a variable by assigning a value to a name using the = operator.

# Creating variables
name = "Alice"
age = 25
height = 5.7
is_student = True

print(name)    # Alice
print(age)     # 25
print(height)  # 5.7

Python Data Types

• •str — Text strings: "Hello", 'World'
• •int — Whole numbers: 42, -10, 0
• •float — Decimal numbers: 3.14, -0.5
• •bool — True or False
• •list — Ordered collection: [1, 2, 3]
• •dict — Key-value pairs: {"name": "Alice"}
• •tuple — Immutable sequence: (1, 2, 3)
• •None — Represents absence of value

# Check the type of a variable
name = "Alice"
age = 25
pi = 3.14159
is_active = True

print(type(name))      # <class 'str'>
print(type(age))       # <class 'int'>
print(type(pi))        # <class 'float'>
print(type(is_active)) # <class 'bool'>