How to use the debugpy.wait_for_attach function in debugpy

if secret and port:
            # Start tests with legacy debugger
            import ptvsd
            from ptvsd.debugger import DONT_DEBUG, DEBUG_ENTRYPOINTS, get_code
            from ptvsd import enable_attach, wait_for_attach
            
            DONT_DEBUG.append(os.path.normcase(__file__))
            DEBUG_ENTRYPOINTS.add(get_code(main))
            enable_attach(secret, ('127.0.0.1', port), redirect_output = True)
            wait_for_attach()
        elif port:
            # Start tests with new debugger
            import debugpy 
            
            debugpy.enable_attach(('localhost', port))
            debugpy.wait_for_attach()
        elif mixed_mode:
            # For mixed-mode attach, there's no ptvsd and hence no wait_for_attach(), 
            # so we have to use Win32 API in a loop to do the same thing.
            from time import sleep
            from ctypes import windll, c_char
            while True:
                if windll.kernel32.IsDebuggerPresent() != 0:
                    break
                sleep(0.1)
            try:
                debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x86.dll']
            except WindowsError:
                debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x64.dll']
            isTracing = c_char.in_dll(debugger_helper, "isTracing")
            while True:
                if isTracing.value != 0:

sys.stderr = _TestOutput(sys.stderr, is_stdout = False)

    if opts.secret and opts.port:
        from ptvsd.debugger import DONT_DEBUG, DEBUG_ENTRYPOINTS, get_code
        from ptvsd import DEFAULT_PORT, enable_attach, wait_for_attach

        DONT_DEBUG.append(os.path.normcase(__file__))
        DEBUG_ENTRYPOINTS.add(get_code(main))

        enable_attach(opts.secret, ('127.0.0.1', getattr(opts, 'port', DEFAULT_PORT)), redirect_output = True)
        wait_for_attach()
    elif opts.port:   
        import debugpy
        
        debugpy.enable_attach(('127.0.0.1', getattr(opts, 'port', 5678)))
        debugpy.wait_for_attach()
    elif opts.mixed_mode:
        # For mixed-mode attach, there's no ptvsd and hence no wait_for_attach(), 
        # so we have to use Win32 API in a loop to do the same thing.
        from time import sleep
        from ctypes import windll, c_char
        while True:
            if windll.kernel32.IsDebuggerPresent() != 0:
                break
            sleep(0.1)
        try:
            debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x86.dll']
        except WindowsError:
            debugger_helper = windll['Microsoft.PythonTools.Debugger.Helper.x64.dll']
        isTracing = c_char.in_dll(debugger_helper, "isTracing")
        while True:
            if isTracing.value != 0: