[Python] TypeError: '<' not supported between instances of 'NoneType' and 'int'. Anyone knows...

Here's the code.

digs = (-10, 0, 7, -2, 3, 6, -8)

def sort(x):
if x < 0:
return False

print(sorted(digs, key=sort))


When launched the following error appears. Can anyone explain why?

I figured it out that I can do this:

def sort(x):
return x >= 0


and it's gonna work fine. But I still don't get why that error shows up when comparing x and 0.

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