I'm basically completely new to anaconda, spyder, and python. I've installed anaconda navigator 1.9.12 (today) that comes with Spyder 4.1.1. The first program in the tutorial runs without apparent error except it doesn't print hello world at least to the console. [stdout pointed elsewhere?] I have restarted my computer (old imac running 10.13.6) several times and reinstalled anaconda three times. I had a previous version of anaconda and spyder that worked fine 2 - 3 months ago. When I logged in today, I was offered to upgrade spyder to 4. That spyder upgrade didn't complete, so I figured to just start again with anaconda navigator.
def hello():
"""Print "Hello World" and return None."""
print("Hello World")