TypeError: unbound method strftime() must be called with datetime instance as first argument (got str instance instead) at Form1, line 38

Question

我正在尝试让我的代码在 HH:MM:SS 内显示我的 "def timer_progress_tick(self, **event_args):" 而不是仅仅几秒钟。

https://docs.python.org/3/library/datetime.html - 查看 python 日期时间库。

 from datetime import datetime

 def timer_progress_tick(self, **event_args):
   """This method is called Every [interval] seconds. Does not trigger if 
   [interval] is 0."""
     if self.start_time is not None:
       self.label_time_elapsed.text = "{}".format(
         datetime.strftime('%H:%M:%S', (datetime.now() - self.start_time))
       )

我明白了；

TypeError: 未绑定方法 strftime() 必须以 datetime 实例作为第一个参数调用（取而代之的是 str 实例） 在 Form1，第 38 行

Answer 1

你用错了strftime。它是对象的方法，不能从模块中调用。

self.label_time_elapsed.text = "{}".format(
         (datetime.now() - self.start_time).strftime('%H:%M:%S'))
       )