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Your First Python Program: The 'Hello World' Tradition

Python Programming: The 0 to Hero Bootcamp

The Python Interpreter and Your First Program

The Interactive Interpreter

Python can be run interactively. Open your terminal and type python (or python3). You will see the >>> prompt. This is great for testing small snippets.

python

2 + 2 4 'Hello' + ' World' 'Hello World' exit()

Writing and Running a Script

Create a file named hello.py and put the following single line inside it:

python

hello.py

print('Hello, Python World!')

Running the Script

  1. Navigate to the directory where you saved hello.py using your terminal.
  2. Execute the script using the Python interpreter:

bash python hello.py

Output:

Hello, Python World!

Comments

Comments are lines that the interpreter ignores. They are used to explain the code. Use the # symbol for single-line comments.

python

This is a comment explaining the next line of code.

print('This line runs.') # This is an inline comment.