test_sys_settrace.py 文件源码

def test_jump_to_firstlineno(self):
        # This tests that PDB can jump back to the first line in a
        # file.  See issue #1689458.  It can only be triggered in a
        # function call if the function is defined on a single line.
        code = compile("""
# Comments don't count.
output.append(2)  # firstlineno is here.
output.append(3)
output.append(4)
""", "<fake module>", "exec")
        class fake_function:
            __code__ = code
            jump = (2, 0)
        tracer = JumpTracer(fake_function)
        sys.settrace(tracer.trace)
        namespace = {"output": []}
        exec(code, namespace)
        sys.settrace(None)
        self.compare_jump_output([2, 3, 2, 3, 4], namespace["output"])