Python Modules Tutorial for Beginners

1. Importing a module

import math

2. Using a function from a module

import math
print(math.sqrt(16))  # Output: 4.0

3. Using a constant from a module

import math
print(math.pi)  # Output: 3.141592653589793

4. Importing only a specific item from a module

from math import pi
print(pi)  # Output: 3.141592653589793

5. Importing multiple items from a module

from math import pi, sqrt
print(pi)        # Output: 3.141592653589793
print(sqrt(16))  # Output: 4.0

6. Renaming imported items

from math import sqrt as square_root
print(square_root(16))  # Output: 4.0

7. Importing all items from a module

from math import *
print(pi)        # Output: 3.141592653589793
print(sqrt(16))  # Output: 4.0

8. Checking the items defined in a module

import math
print(dir(math))

9. Creating a custom module

def greet(name):
    return f"Hello, {name}!"

10. Importing a custom module

import mymodule
print(mymodule.greet("Alice"))  # Output: Hello, Alice!