1.線程共享變量
多線程和多程序不同之處在于,多線程本身就是可以和父線程共享記憶體的,這也是為什麼其中一個線程挂掉以後,為什麼其他線程也會死掉的道理。
import threading
def worker(l):
l.append("li")
l.append("and")
l.append("lou")
if __name__ == "__main__":
l = []
l += range(1, 10)
print (l)
t = threading.Thread(target=worker, args=(l,))
t.start()
print (l)
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傳回結果:
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 'li', 'and', 'lou']
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2.線程池(擴充内容,了解即可)
通過傳入一個參數組來實作多線程,并且它的多線程是有序的,順序與參數組中的參數順序保持一緻。
安裝包:
pip install threadpool
調用格式:
from threadpool import *
pool = TreadPool(poolsize)
requests = makeRequests(some_callable, list_of_args, callback)
[pool.putRequest(req) for req in requests]
pool.wait()
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舉例:
import threadpool
def hello(m, n, o):
print ("m = {0}, n = {1}, o = {2}".format(m, n, o))
if __name__ == "__main__":
#方法一:
lst_vars_1 = ['1','2','3']
lst_vars_2 = ['4','5','6']
func_var = [(lst_vars_1,None), (lst_vars_2, None)]
#方法二:
dict_vars_1 = {'m':'1','n':'2','o':'3'}
dict_vars_2 = {'m':'4','n':'5','o':'6'}
func_var = [(None, dict_vars_1), (None, dict_vars_2)]
pool = threadpool.ThreadPool(2)
requests = threadpool.makeRequests(hello, func_var)
[pool.putRequest(req) for req in requests]
pool.wait()
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傳回結果:
m = 1, n = 2, o = 3
m = 4, n = 5, o = 6
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