[Python] I was running a python program and I got an error saying expected type 'Sized', got...

d_n_a = ["A", "T", "G", "C"]
is_not_dna = not d_n_a
if len(is_not_dna) > 0:
print(True)
else:
print(False)

Expected type 'Sized', got 'bool' instead:54
​

I was expecting it to return a false value as long as the character is not in d_n_a although I'm quite new to Python so I was just testing it out.

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