Lesson 01 - Hello World

What is a function?

What is Python?

Python is a programming language. Programming languages allow humans to give instructions to computers.

Python is popular because it is:

  • Easy to read
  • Used in real jobs (games, websites, AI, data science)
  • Great for beginners
Think of it this way:

Python is like writing very clear instructions that a computer follows exactly.

What is a function?

A function is a block of code that performs a job.

Some functions are already built into Python. Others are written by programmers.

Real-world example:

A microwave has a “Start” button. When you press it, a series of steps happen automatically. That is similar to how a function works.

What does print() do?

print() is a built-in Python function.

It tells Python to display text on the screen.

If you write:
print("Hello world")
Python will show:
Hello world

Why “Hello world”?

Almost every programmer starts with a Hello world program.

It proves:

  • Your code runs correctly
  • The computer understands your instructions
  • You are ready to move on to harder tasks

Hello World Challenge

Your task is to write Python code that prints exactly:

Hello world
Rules:
  • Use print()
  • Capital letters must match
  • No extra spaces or text
Student Name:
Output:
Loading Python…