python语法基础正则表达式的贪婪默认与非模式

importresultimportresultre.sub('\d+''1''a12345bbbb67c890d0e'print(result)#resultre.sub('\d+?''1''a12345bbbb67c890d0e'print(result)#1编写一个简单的人机（测试ABxxC用户输入“123”（完成简单的加法运算defpattern1defpattern1result=re.match(pattern1,inputStr)ifresult:returnpattern2result=re.match(pattern2,inputStr)ifresult:strresult.group(1)returnstrpattern3'(\d+)加(\d+)result=re.match(pattern3,inputStr)ifresult:value1=int(result.group(1))value2=value3value3value1value2str='等于%d'%value3returnstrreturnwhileinputStrinput('请输入：')result=robot(inputStr)（C语言程序、Java语言程序、python语言程序多进程。2比如：总共有2个进程，每个进程各启动2个线程（线程 、线程、线程、线程）。快但是在写程序的时候需要注意：1个Python程序原则上是一个进程，在这个进启动了1个电脑上启动了多个QQQQ一个进程启动后，至少会有一个线程运行中。这个线程称为主线程。在一些app应用程序UIUI操作都需要实时的响应，O(2n)O(n!)O(n2)O(nlogn)O(n)O(logn)pythonimportname=threading.current_thread().getName()importname=threading.current_thread().getName()说明目前是在主线运行defdefnamethreading.current_thread().getName()print('run,name)t.start()classclassdefname=threading.current_thread().getName()print('MyThreadrunname)importimportdefname=foriinrange(100):print(name,':',i)foriint=threading.Thread(target=run)numnum0defglobalforiinrange(num+=1defdefglobalforiinrange(num+=1t1=threading.Thread(target=t2=threading.Thread(target=num+=1num=临时变量(tmp)。这个不是一个原子操作。有可能在中间被打乱。1num+11tmp12num+11，保存到临时变量tmp2中。1num=tmpnum=112都执行了+1执子线程子线程子线程子线程获取获取子线程子线程子线程获取

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从出生到sleepsleep调度run创 启 运importthreadingimporttimeclassMyThread(threading.Thread):defrun(self):namethreading.current_thread().getName()print('睡眠前运行中的线程：',name)print('睡眠后运行中的线程：'t1=MyThread()t2=MyThread()t3=MyThread()importthreadingimporttimeimportthreadingimporttimenum0defglobalnum, while flagTrueflag=foriinrange( num+=1flag=defglobalnum, while flagTrueflag=foriinrange( num+=1flag=t1=threading.Thread(target=run1)t2=threading.Thread(target=run2)Python中用到的锁，称为互斥锁（mutex）mutexmutex=mutex.acquire([blocking],加锁mutex.acquire([blocking],blocking描述上锁的时候是否阻塞。True为阻塞（默认值），False为不阻塞。timeout表示超时时间。blockingTrue的时候，timeoutimportimportnum0mutexthreading.Lock()defglobalmutex.acquire()blockingforiinrange( num+=1mutex.release()#defglobalmutex.acquire()blockingforiinrange( num+=1mutex.release()#t1=threading.Thread(target=run1)t2=threading.Thread(target=run2)importimportnum0mutexthreading.Lock()defglobalforiinrange(num+=1blocking#defglobalforiin mutex.acquire()blockingnum+=1mutex.release()#t1=threading.Thread(target=run1)t2=threading.Thread(target=400300importthreadingimportthreadingimporttimenum500defpos(money,name):globalnum#尝试扣款ifnum>=money:print('%snum-=moneyprint('消费%dmoney)print('余额为%d't1=threading.Thread(target=pos,args=(400,'pos1'))t2=threading.Thread(target=pos,args=(300,'pos2'))importimportthreadingimporttimelist1=[3,list2=[7,mutex1threading.Lock()mutex2threading.Locklist1[0]defgloballist1,value1=list1[0]time.sleep(0.1)#故意延时value2=list2[0]result=value1+value2defgloballist1,list2mutex2.acquire()list2value2=list2[1]time.sleep(0.1)#故意延时mutex1.acquire()list1value1=list1[1]result=value1+value2mutex1.release()list1mutex2.release()list2t1=threading.Thread(target=fun1)t2=threading.Thread(target=fun2)importimportthreadingimporttimelist1=[3,4]list2=[7,mutex1threading.Lock()mutex2threading.Lock()list1[0]defgloballist1,ifmutex1.acquire(timeout=1list1value1=list1[0]time.sleep(0.1)value2=list2[0]result=value1+value2defgloballist1,if