function1生成生成两个名为daydate和numbers的变量。要实现的是function2接收这些变量,打印并将它们存储在数据帧中。这个过程保持完整是非常重要的。
import random
from multiprocessing import Process
import time
from datetime import datetime
def function1():
while True:
daydate = datetime.now()
numbers = random.randrange(1,215)
print(daydate, numbers)
time.sleep(10)
def function2():
while True:
print("Recevied values from function1: (daydate, numbers)")
time.sleep(10)
if __name__ == "__main__":
a =Process(target=function1, args=())
a.start()
b =Process(target=function2, args=())
b.start()
a.join()
b.join()
答案 0 :(得分:1)
可能最通用的方法是使用multiprocessing.Manager
,因为它可以转移list
和dict
类型。与...不同Value
或Array
不限于一种类型。我已将代码重新编写到下面的示例中。
import random
from multiprocessing import Process, Manager
import time
from datetime import datetime
def function1(d):
while True:
daydate = datetime.now()
number = random.randrange(1, 215)
print('Sent do function2: ({}, {})'.format(daydate, number))
d['date'] = daydate
d['number'] = number
time.sleep(2)
def function2(d):
while True:
print("Recevied values from function1: ({}, {})".format(d['date'], d['number']))
time.sleep(2)
if __name__ == "__main__":
with Manager() as manager:
d = manager.dict()
a = Process(target=function1, args=(d,))
a.start()
b = Process(target=function2, args=(d,))
b.start()
a.join()
b.join()
这会产生以下输出:
> python3 manager.py
Sent do function2: (2017-12-31 10:52:33.405475, 80)
Recevied values from function1: (2017-12-31 10:52:33.405475, 80)
Recevied values from function1: (2017-12-31 10:52:33.405475, 80)
Sent do function2: (2017-12-31 10:52:35.466549, 71)
Sent do function2: (2017-12-31 10:52:37.566320, 138)
Recevied values from function1: (2017-12-31 10:52:35.466549, 71)
Sent do function2: (2017-12-31 10:52:39.601367, 124)
Recevied values from function1: (2017-12-31 10:52:37.566320, 138)
Sent do function2: (2017-12-31 10:52:41.626318, 183)
Recevied values from function1: (2017-12-31 10:52:39.601367, 124)
如您所见,这可以多次检索相同的值。要只获得一次值,请使用multiprocessing.Queue
:
import random
from multiprocessing import Process, Queue
import time
from datetime import datetime
def function1(q):
while True:
daydate = datetime.now()
number = random.randrange(1, 215)
print('Sent to function2: ({}, {})'.format(daydate, number))
q.put((daydate, number))
time.sleep(2)
def function2(q):
while True:
date, number = q.get()
print("Recevied values from function1: ({}, {})".format(date, number))
time.sleep(2)
if __name__ == "__main__":
q = Queue()
a = Process(target=function1, args=(q,))
a.start()
b = Process(target=function2, args=(q,))
b.start()
a.join()
b.join()
这会产生以下输出:
> python3 qtest.py
Sent to function2: (2017-12-31 11:13:34.331509, 54)
Recevied values from function1: (2017-12-31 11:13:34.331509, 54)
Sent to function2: (2017-12-31 11:13:36.337707, 194)
Recevied values from function1: (2017-12-31 11:13:36.337707, 194)
Sent to function2: (2017-12-31 11:13:38.472709, 171)
Recevied values from function1: (2017-12-31 11:13:38.472709, 171)
答案 1 :(得分:0)
Your Program is Correct it shows proper output.
I run The program and i get OUTPUT
(datetime.datetime(2017, 12, 31, 12, 27, 19, 930988), 168)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 27, 29, 941160), 12)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 27, 39, 951035), 21)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 27, 49, 958898), 191)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 27, 59, 963084), 118)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 28, 9, 971400), 194)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 28, 19, 978968), 170)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 28, 29, 986960), 40)
Recevied values from function1: (daydate, numbers)
(datetime.datetime(2017, 12, 31, 12, 28, 39, 995139), 94)