def tracer(self, frame, event, arg):
        lineno = frame.f_lineno
        filename = frame.f_globals["__file__"]
        if [".pyc", ".pyo"] in filename[-4:]:
            filename = filename[:-1]
        self.lines[filename][lineno] = self.lines.setdefault(filename, {}).get(lineno, 0) + 1
        return self.tracer
dataset/ETHPy150Open anandology/pyjamas/pyjs/tests/test-coverage.py/Coverage.tracer/swapped operands of `in`