Python Tutorial for Beginners #2 - Variables & Data Types (str, int, float, bool)

Python Tutorial for Beginners #2 - Variables & Data Types (str, int, float, bool)

In this lesson, you’ll learn how to create variables and understand Python’s four basic data types: string, integer, float, and boolean. We’ll also explore the dynamic typing feature of Python and how to use the type() function to check variable types, along with the special None value.

Code

# Creating variables with different data types
name = "Alice"       # str: text data
age = 25             # int: whole number
height = 5.6         # float: decimal number
is_student = True    # bool: True or False

# Check types using the type() function
print(type(name))      # <class 'str'>
print(type(age))       # <class 'int'>
print(type(height))    # <class 'float'>
print(type(is_student))# <class 'bool'>

# Dynamic typing: variables can change type
x = 10                # x is an int
print(type(x))        # <class 'int'>
x = "hello"           # now x is a str
print(type(x))        # <class 'str'>

# None value represents absence of a value
result = None
print(result is None)  # True, checks if result is None

Key Points

• Variables store values and are created by assigning with the equal sign.
• Python’s basic data types include str (string), int (integer), float (decimal), and bool (boolean).
• The type() function reveals the data type of any variable.
• Python uses dynamic typing, so a variable’s type can change during execution.
• None is a special value used to indicate the absence of a value.