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Yes, but how would you print that infinite sequence of 1s?

same as the infinite number of zeros in front of a positive number.

Just trimming 1s would be ambiguous. Is b11 3 or -2? You would have to add a 0 prefix to all positive numbers or some other to negative.

Just prefix a + or - just like you do for base 10.

So then it would not make much of a difference anymore with what Python does. Which was what they wanted to avoid.