Python线程未并行处理

Question

我是 python 的中级蜜蜂，想以并行模式运行少数几个相同的类实例，以获取金融市场的数据和决策。为了继续我的想法，我运行下面的代码来查看 python 是如何工作的，它似乎运行了一个完整的一级实例，在二级实例之后，我想并行运行这个，我怎么能......？下面是一些用于测试的示例代码..

import threading
import time

class thr(object):

  def __init__(self, name):
     self.name = name
     self.x = 0

  def run(self):
     for i in list(range(10)):
         self.x +=1
         print("something {0} {1}".format(self.name, self.x))
         time.sleep(1)            

F = thr("First")
S = thr("Second")

threading.Thread(target=F.run())
threading.Thread(target=S.run())

结果如下....

something First 1
something First 2
something First 3
something First 4
something First 5
something First 6
something First 7
something First 8
something First 9
something First 10
something Second 1
something Second 2
something Second 3
something Second 4
something Second 5
something Second 6
something Second 7
something Second 8
something Second 9
something Second 10
Out[27]: <Thread(Thread-25, initial)>

Answer 1

问题出在这里:

threading.Thread(target=F.run())
threading.Thread(target=S.run())

target= 采用可调用对象或 None。 F.run() 立即执行 F.run，等待它完成，然后传递返回值(None 在您的 run() 方法中)作为目标。

你想要这样的东西:

t1 = threading.Thread(target=F.run)
t2 = threading.Thread(target=S.run)
t1.start()
t2.start()

注意 run 之后没有括号

这是包含建议更改的完整程序:

import threading
import time

class thr(object):

  def __init__(self, name):
     self.name = name
     self.x = 0

  def run(self):
     for i in list(range(10)):
         self.x +=1
         print("something {0} {1}".format(self.name, self.x))
         time.sleep(1)            

F = thr("First")
S = thr("Second")

t1 = threading.Thread(target=F.run)
t2 = threading.Thread(target=S.run)
t1.start()
t2.start()

和输出(Python 3.6.1):

$ python sf.py
something First 1
something Second 1
something Second 2
something First 2
something Second 3
something First 3
something Second 4
something First 4
something Second 5
something First 5
something Second 6
something First 6
something Second 7
something First 7
something First 8
something Second 8
something First 9
something Second 9
something First 10
something Second 10