python多线程处理文件_Python实验：采用多线程在一个文件中查找特定字符串

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import threading , time

def countstr(f):

global findstr,occurtimes

times=0

for string in f:

if findstr in string:

times+=1

occurtimes.append(times)

occurtimes=[]

threadnum=int(raw_input("please input thread number:"))

filename=raw_input("please input filename:")

findstr=raw_input("please input to find string:")

text=open(filename).readlines()

start=time.time()

threads=[]

for i in range(threadnum):

t=threading.Thread(target=countstr,args=(text[i::threadnum],))

threads.append(t)

t.start()

for t in threads:

t.join()

end=time.time()

print("multithread using %.5f seocnds"%(end-start))

print('string "%s" occurs %d times'%(findstr,sum(occurtimes)))

print

occurtimes=[]

start=time.time()

countstr(text)

end=time.time()

print("singlethread uing %.5f seconds"%(end-start))

print('string "%s" occurs %d times'%(findstr,sum(occurtimes)))

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