Hi Itzel,
I'm really sorry for the slow (and now, likely, useless) reply - some COVID related things mean I've been mostly off work for a long time. Still, here's the answer to your query in case it's still useful...
You need to write the full commandline before hitting enter. That's it!
Right now you are typing 'python' then hitting enter, and then typing the rest of the commandline. Instead, type out the whole thing, and only then hit enter.
Rob