[英]python - multithreading — join() method
import threading, time
class test(threading.Thread):
def __init__(self,name,delay):
threading.Thread.__init__(self)
self.name = name
self.delay = delay
def run(self):
c = 0
while True:
time.sleep(self.delay)
print 'This is thread %s on line %s' %(self.name,c)
c = c + 1
if c == 15:
print 'End of thread %s' % self.name
break
one = test('one', 1).start()
two = test('two', 3).start()
one.join()
two.join()
print 'End of main'
Problem: cannot get join() methods to work properly, gives the following error: 问题:无法使join()方法正常工作,给出以下错误:
Traceback (most recent call last)line 29, in <module> join() NameError: name 'join' is not defined
if i remove: 如果我删除:
one.join
two.join
the code works perfectly fine. 代码工作得非常好。
I wanted to print the last line, 我想打印最后一行,
print 'End of main'
after the two threads have ended. 两个线程结束后。 I can't seem to understand why join() is not an attribute of the two instances?
我似乎无法理解为什么join()不是这两个实例的属性?
one = test('one', 1).start()
two = test('two', 3).start()
Your problem is that start()
doesn't do a return self
. 你的问题是
start()
没有return self
。 one
and two
are not threads. one
和two
不是线程。 They're None
or whatever the return value of start()
actually is. 它们是
None
或者start()
的返回值实际上是什么。
This works: 这有效:
one = test('one', 1)
one.start()
two = test('two', 3)
two.start()
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