Question: The error is at `script, first, second, third = argv`. I would like to understand why I am getting the error and how to fix it.

```
from sys import argv

script, first, second, third = argv
print("The script is called: ", script)
print("The first variable is: ", first)
print("The second variable is: ", second)
print("The third variable is: ", third)

```

Answer: 
`argv` variable contains command line arguments. In your code you expected 4 arguments, but got only 1 (first argument always script name). You could configure arguments in `pycharm`. Go to `Run` -> `Edit Configurations`. Then create a new python configuration. And there you could specify `Script parameters` field. Or you could run your script from command line as mentioned by dnit13.
You could run it like this: python script.py first, second, third