How could this code figure out the sign bit like '+' and '-' and put it at the beginning of result?

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    I dont under stant that if you use '^[+-0]', it should fillter out the signal bit in the str and return a str with no signal bit. Then the code return the result = int(''.join(str)) directly. How could the result contain the signal bits like '+' and '-' after re.findall()?

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