代码返回无值，应返回整数

Question

尝试在下面调试我的代码，它应该自行循环执行，直到完成相关的图像识别检查为止。循环工作正常，但是应该在返回值为{1的rsa_clip的情况下返回None。

代码；

def mbox(title, text, style):
    return ctypes.windll.user32.MessageBoxW(0, text, title, style)

def rsa():
    try:
        # look for RSA icon in taskbar
        pyautogui.locateOnScreen(os.path.expanduser(os.sep.join(["~", "My Documents", 'rsa_icon.png'])),
                                 confidence=0.9)
        try:
            # see if there is enough time to copy the RSA code
            pyautogui.locateOnScreen(os.path.expanduser(os.sep.join(["~", "My Documents", 'rsa_pips.png'])),
                                     confidence=0.9)
            print('pips found')
            x = pyautogui.locateCenterOnScreen(
                os.path.expanduser(os.sep.join(["~", "My Documents", 'rsa_copy.png'])), confidence=0.9)
            print('copy button found')
            pyautogui.click(x)
            print('copy button clicked')
            rsa_clip = 1
            print(rsa_clip)
            print('From the RSA function')
            print(rsa_clip)
            return rsa_clip
        except:
            # explaining not enought time and looping
            mbox('Warning', 'Please wait for timeout on current token',0)
            time.sleep(20)
            rsa()
    except:
        # open RSA application
        rsa_p = r'C:\ProgramData\Microsoft\Windows\Start Menu\Programs\RSA\RSA SecurID Token'
        os.chdir(rsa_p)
        mbox('Info', 'Please enter your Pin', 0)
        os.startfile('RSA SecurID Token')
        time.sleep(5)
        rsa()


print(rsa())

输出：

pips found
copy button found
copy button clicked
1
From the RSA function
1
None