Use `import script_name`

Use `from script_name import function_name`

Call a function with `function_name()`

Run a script from another script with `subprocess.run(["python", "script_name.py"])`

Execute a script file with `exec(open("script_name.py").read())`

Use `runpy.run_path("script_name.py")`

Call a script as a module with `python -m module_name`

Use `os.system("python script_name.py")`