> For the complete documentation index, see [llms.txt](https://prof-rossetti.gitbook.io/intro-to-python/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prof-rossetti.gitbook.io/intro-to-python/exercises/hello-world/local.md).

# "Hello World (Local)" Exercise

## Learning Objectives

In this exercise, we'll practice using the local development environment to create, edit, and execute a simple Python program.

## Prerequisites

This exercise assumes you have already done the [Command-line Computing Exercise](https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf).

## Instructions

1. Use your text editor to create and save a new file on the Desktop called "my\_script.py".
2. Use your text editor to write some Python code (like the example code below) in the file.
3. Remember to save the file (anytime before running)!
4. From your command-line application, ensure your Anaconda "base" environment is active.
5. From your command-line application, execute the file (`python ~/Desktop/my_script.py`) to see its output.

Example Python code:

```python
# This is some example python code
# These lines starting with # are "comments"

print("HELLO WORLD!")

x = 2 + 2
print(x)
```

## Success Criteria

Once you see the printed messages in your command-line application, you have succeeded. Edit the file (by changing the message or the numbers), save it again, and run it again. Repeat this process more time for good measure.