Practical introduction to python's subprocess module

## practical introduction to python's `subprocess` module

the `subprocess` module in python is a powerful tool that allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. this module is commonly used for executing shell commands and managing subprocesses.

### why use `subprocess`?

- **control over command execution**: you can run external commands and control their input/output.
- **error handling**: capture errors and return codes from the commands.
- **cross-platform compatibility**: works on different operating systems (windows, macos, linux).

### basic functions of `subprocess`



#### explanation:
- `['echo', 'hello, world!']`: the command to run. this is split into a list where the first element is the command and the rest are arguments.
- `capture_output=true`: captures standard output and standard error.
- `text=true`: returns output as strings rather than bytes.

#### explanation:

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