updatecallback.py 文件源码

def __init__(self, callback, interval=1):
        """
        :param callback: a function with one arg to execute every so often
        :type callback: function
        :param interval: number of seconds at most between the updates
        :type interval: int
        """
        if isinstance(callback, collections.Callable):
            # callback is really callable
            self.update = self.update_real
            self.callback = callback
            self.interval = interval
        else:
            self.update = self.update_empty
        self.count = 0
        self.oldval = 0
        self.oldtime = 0
        self.text = ""
        self.total = 1