python多线程的简单使用

from time import sleep
import datetime

def x1():
start_time=datetime.datetime.now()
sleep(5)
end_time=datetime.datetime.now()
print (end_time-start_time).seconds

def x2():
start_time=datetime.datetime.now()
sleep(7)
end_time=datetime.datetime.now()
print (end_time-start_time).seconds

if __name__=='__main__':
start_time=datetime.datetime.now()
x1()
x2()
end_time=datetime.datetime.now()
print 'The main time is',(end_time-start_time).seconds

from time import sleep
from multiprocessing.dummy import Pool as ThreadPool
import datetime
import numpy as np

def f(x):
start_time=datetime.datetime.now()
sleep(x)
end_time=datetime.datetime.now()
print (end_time-start_time).seconds

x=np.array([5,7])

if __name__=='__main__':
start_time = datetime.datetime.now()
pool = ThreadPool()
results = pool.map(f,x)
pool.close()
pool.join()

end_time = datetime.datetime.now()
print 'The sum time is',(end_time-start_time).seconds