def peek(self):
        offset, string = self.file.peek()
        if len(string) < offset:
            # fast path:
            return string[offset]
        pos = self.file.tell()
        res = self.file.read(1)
        self.file.seek(pos, 0)
        return res
dataset/ETHPy150Open samth/pycket/pycket/values.py/W_FileInputPort.peek/swapped operands of `<`