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keith rezendes4,459 Points
What's up with the challenges lately, nothing seems to work and the error messages don't help.
See my code and more importantly, the error message, don't change string, I didn't even touch it.
import re string = '1234567890' good_numbers = re.findall(r'[^567]', string)
The problem is you're checking each character to see if it's a '5', '6' or '7' and then returning the character. If you run that in Python you'll see that the response is
['1', '2', '3', '4', '8', '9', '0'], which is not what is wanted. It should return
['1234', '890']. To get that you need to match groups of at least 1 character that isn't a '5', '6' or '7'. The correct solution is
good_numbers = re.findall(r"[^567]+", string)