Write a Hello-World application in python.
Here is a hello world application in python:
```python
print(Hello, world!)
```

Save that code in a file named `hello_world.py` and execute it by typing `python hello_world.py` (or `python3 hello_world.py`, depending on how you installed python) into a terminal in the same directory.
The file is located in C:\Users:\Documents\hello_worlds.py. Please give me detailed explanations on how to run it from the command prompt. Would love to see your answers.