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Variables and Types

5 min read Quiz at the end

Python uses dynamic typing — no need to declare variable types. Variables are created on assignment: name = 'Alice'. Types include int, float, str, bool, and None. Use type() to check and isinstance() for type testing.

Variables and Data Types

name    = "Alice"    # str
age     = 25        # int
height  = 5.7       # float
is_active = True    # bool

# Type checking
print(type(name))   # <class 'str'>

# Dynamic typing
x = 10
x = "now a string"  # perfectly valid

← Installing Python Next: Strings →

Topic Quiz · 5 questions

Test your understanding before moving on

1. Which is a valid Python variable name?

💡 _count is valid — variable names can start with underscore but not digits or hyphens.

2. What type is True in Python?

💡 True and False are Python booleans (which are a subclass of int).

3. How do you check a variable's type?

💡 type(variable) returns the type of a Python variable.

4. What does None represent?

💡 None is Python's null value — represents the absence of a value.

5. Can a variable change type in Python?

💡 Python is dynamically typed — a variable can be reassigned to any type.

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Variables and Types

Variables and Data Types

Test your understanding before moving on