Pythonic方式返回布尔值和消息

这个问题在这里已经有了答案：

你如何在Python中返回多个值？ 13个答案

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Python中的空字符串“falsey”，所以返回有点多余（False，''）。 我可能会这样做：

def processGroupFound():
    if _isProcessRunning('ps auwxx | grep duplicity'):
        return 'Duplicity'
    elif _isProcessRunning('who | grep pts'):
        return 'SSH'
    elif _isProcessRunning('netstat -na | grep ESTA | grep 5901'):
        return 'VNC'
    else:
        return ''

def worker():
    while True:
        service_string = processGroupFound()
        if service_string:
            print('{} found; skipping'.format(service_string))
        else:
            print('Continuing on')
        time.sleep(10)

（见4.1真值测试）

---

我认为这也会是pythonic（但可能只是我）

class NoRunningService(RuntimeError): pass

def findService():
    if _isProcessRunning('ps auwxx | grep duplicity'):
        return 'Duplicity'
    elif _isProcessRunning('who | grep pts'):
        return 'SSH'
    elif _isProcessRunning('netstat -na | grep ESTA | grep 5901'):
        return 'VNC'
    else:
        raise NoRunningService

def worker():
    while True:
        try:
            service_string = findService()
        except NoRunningService:
            print('Continuing on')
        else:
            print('{} found; skipping'.format(service_string))
        time.sleep(10)

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