正如其他人指出的那樣,錯誤是因為你沒有将正确的參數傳遞給threading.Timer()方法.在5秒後更正将運作您的功能一次.有很多方法可以讓它重複.
一個object-oriented方法是派生一個新的threading.Thread子類.雖然可以建立一個特别符合你想要的 – 即列印“％s”％hello – 但是制作一個更通用的參數化子類隻會稍微困難一些,它将調用一個傳遞給它的函數.執行個體化(就像threading.Timer()).如下圖所示：
import threading
import time
class RepeatEvery(threading.Thread):
def __init__(self, interval, func, *args, **kwargs):
threading.Thread.__init__(self)
self.interval = interval # seconds between calls
self.func = func # function to call
self.args = args # optional positional argument(s) for call
self.kwargs = kwargs # optional keyword argument(s) for call
self.runable = True
def run(self):
while self.runable:
self.func(*self.args, **self.kwargs)
time.sleep(self.interval)
def stop(self):
self.runable = False
def greeting(hello):
print hello
thread = RepeatEvery(3, greeting, "Hi guys")
print "starting"
thread.start()
thread.join(21) # allow thread to execute a while...
thread.stop()
print 'stopped'
輸出：
# starting
# Hi guys
# Hi guys
# Hi guys
# Hi guys
# Hi guys
# Hi guys
# Hi guys
# stopped
除了重寫基本線程.Thread類的__init __()和run()方法之外,還添加了一個stop()方法,以允許在需要時終止線程.我還簡化了greeting()函數中的列印“％s”％hello,隻列印hello.