SyntaxError: Non-UTF-8 code starting with '\x91'

Question

I am trying to write a binary search program for a class, and I am pretty sure that my logic is right, but I keep getting a non-UTF-8 error. I have never seen this error and

Answer 1

Your editor replaced ' (ASCII 39) with U+2018 LEFT SINGLE QUOTATION MARK characters, usually a sign you used Word or a similar wordprocessor instead of a plain text editor; a word processor tries to make your text 'prettier' and auto-replaces things like simple quotes with fancy ones. This was then saved in the Windows 1252 codepage encoding, where the fancy quotes were saved as hex 91 characters.

Python is having none of it. It wants source code saved in UTF-8 and using ' or " for quotation marks. Use notepad, or better still, IDLE to edit your Python code instead.

You have numerous other errors in your code; you cannot use spaces in your variable names, for example, and Python uses and, not & as the boolean AND operator. != is an operator requiring 2 operands (it means 'not equal', the opposite of ==), the boolean NOT operator is called not.