🔹 Example 1 – Importing a built-in module
Python comes with many modules that you can use right away.
import math
print(math.sqrt(25)) # This uses the sqrt (square root) function from the math module
✅ Explanation:
import math → brings all the tools from the math module.
math.sqrt(25) → uses the square root function inside that module.
🔹 Example 2 – Importing just one part of a module
If you only need one thing, you can import just that part.
from math import pi
print(pi) # Prints 3.141592653589793
✅ Explanation:
from math import pi means “bring only pi from math.”
🔹 Example 3 – Importing your own file
If you made another Python file called greetings.py:
def say_hello(): print("Hello from greetings.py!")
Then in another file:
import greetings
greetings.say_hello()
✅ This lets you reuse your own code in different programs.
