python练习实例

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#!/usr/bin/python # -*- coding: UTF-8 -*-   try:     fh = open("testfile","w")     fh.write("testing") except Exception as e:     print str(e) else:     print 'sucessed'     fh.close()   def functionName(level):     if level <2:         raise Exception("Invalid level!",level)       if __name__ == "__main__":     functionName(1)<br>#............................................. class Networkerror(RuntimeError):     def __init__(self,arg):         self.args = arg try:     raise Networkerror("Bad hostname") except Networkerror,e:     print e.args #........................................................ while True:     reply = input('Enter text:')       if reply == 'stop':break     try:         num = int(reply)     except:         print('bad' * 8)     else:         print (int(reply) * 2)     print 'Bye' #................................................... import py_compile import sys   file = raw_input("please enter your name") py_compile.compile(file) sys.exit() #................................................ #汉诺塔问题 def my_print(args):     print args   def move(n,a,b,c):     my_print((a,'-->',c)) if n==1 else (move(n-1,a,c,b) or move(1,a,b,c) or move(n-1,b,a,c))   move(3,'a','b','c') #............................................................... fruits = ['banana', 'apple', 'mango'] for index in range(len(fruits)):     print '当前水果:', fruits[index]   print "Good bye!"<br> #............................................... #判断10 ~20的范围内质数和非质数 Prime = [] NoPrime = [] for num in range(10,20):     for i in range(2,num):         if num%i == 0:             print '%d不是质数' % num             NoPrime.append(num)             break     else:         print '%d是质数' % num         Prime.append(num) print '质数为：', Prime print '非指数为：', NoPrime   #使用内置 enumerate 函数进行遍历: sequence = [12, 34, 34, 23, 45, 76, 89] for i,j in enumerate(sequence):     print i,j #.............................................<br> #打印空心等边三角形 rows = int(raw_input('输入行数：')) for i in range(0, rows):     for k in range(0, 2 * rows - 1):         if (i != rows - 1) and (k == rows - i - 1 or k == rows + i - 1):             print " * ",         elif i == rows - 1:             if k % 2 == 0:                 print " * ",             else:                 print "   ",         else:             print "   ",     print "\n" #............................................ import os,sys   ret = os.access('test/foo.txt',os.F_OK) print "F_OK - 返回值：%s" % ret   ret = os.access('test/foo.txt',os.R_OK) print "R_OK - 返回值：%s" % ret   ret = os.access('test/foo.txt',os.W_OK) print "W_OK - 返回值：%s" % ret   ret = os.access('test/foo.txt',os.X_OK) print "X_OK - 返回值：%s" % ret #..........................................<br> import os, sys   path = "test/"   # 查看当前工作目录 retval = os.getcwd() print "当前工作目录为 %s" % retval   # 修改当前工作目录 os.chdir( path )   # 查看修改后的工作目录 retval = os.getcwd()   print "目录修改成功 %s" % retval #........................................<br> import os, sys   dirPath = "test/"  print '移除前test目录下有文件：%s' %os.listdir(dirPath) #判断文件是否存在 if(os.path.exists(dirPath+"foo.txt")):     os.remove(dirPath+"foo.txt")     print '移除后test 目录下有文件：%s' %os.listdir(dirPath)  else:     print "要删除的文件不存在！" #...................................................<br> import os,sys import shutil dstPath="test/"   print "目录删除前： %s"  % os.listdir(dstPath) #递归的删除目录及文件 #shutil.rmtree('test/aa') #以下两个函数用于删除空目录文件 os.rmdir("test/aa") #os.removedirs("test/aa") print "目录删除后： %s"  % os.listdir(dstPath) #.................................................<br> class Employee:     empCount = 0     def __init__(self,name,salary):         self.name = name         self.salary = salary         Employee.empCount += 1       def displayCount(self):         print "Total Employee %d " % Employee.empCount     def displayEmployee(self):         print "Name:" , self.name, ",Salary: ", self.salary   emp1 = Employee("yuan", 3000) emp2 = Employee("qiang",4000) #添加属性 emp1.age = 7 emp2.age = 8 #删除对象emp1的属性 #del emp1.age emp1.displayEmployee() emp2.displayEmployee() print "Total emploeey %d" % Employee.empCount print "emp1 is %d years old" %emp1.age print "Employee.__doc__:",Employee.__doc__ print "Employee.__name__:",Employee.__name__ print "Employee.__module__:",Employee.__module__ print "Employee.__bases__:",Employee.__bases__ print "Employee.__dict__:",Employee.__dict__ #.......................................................   #析构函数   class Point:     def __init__(self,x = 0,y = 0):         self.x = x         self.y = y     def __del__(self):         class_name = self.__class__.__name__         print class_name ,"销毁"   pt1 = Point() pt2 = pt1 pt3 = pt1 print id(pt1),id(pt2),id(pt3) #打印出对象的 #调用析构函数进行对象的销毁 del pt1 del pt2 del pt3 #................................................<br> class Parent:     parentAttr = 100     def __init__(self):         print "调用父类构造函数"       def parentMethod(self):         print "调用父类方法"       def setAttr(self,attr):         Parent.parentAttr = attr       def getAttr(self):         print "父类属性：",Parent.parentAttr     def aa(self):         print "调用父类aa"   class Child(Parent):     def __init__(self):         print "调用子类构造函数"       def childMethod(self):         print "调用子类方法"     def aa(self):         print "调用子类aa"   c = Child()    #实例化子类 c.childMethod() c.parentMethod() c.setAttr(200) c.getAttr() c.aa() #...................................... #元素符重载   class Vector():     def __init__(self,a,b):         self.a = a         self.b = b     def __str__(self):         return 'Vector (%d,%d)' %(self.a,self.b)     def __add__(self, other):         return Vector(self.a +other.a,self.b+other.b)   v1 = Vector(2,10) v2 = Vector(5,-2) print v1+v2 #....................................................<br> class JustCounter:     __secretCount = 0  #私有成员     publicCount = 0    #公有成员     def count(self):         self.__secretCount += 1         self.publicCount += 1         print self.__secretCount   counter = JustCounter() counter.count() counter.count() print counter.publicCount #print counter.__secretCount  #报错，私有成员，不能通过对象进行访问 print counter._JustCounter__secretCount  #可以通过object._className__attrName 这样组合的方式进行访问私有成员 #.............................................<br> #re成员函数match和search   import re print (re.match("www","www.baidu.com").span()) print (re.match("baidu","www.baidu.com")) #........................................<br> import re   line = "Cats are smarter than dogs"   matchObj = re.search('dogs',line,re.M|re.I)   if matchObj:     print "search----matchObj.group(): ", matchObj.group() else:     print "No match!"   matchObj = re.match('dogs',line,re.M|re.I)   if matchObj:     print "match----matchObj.group(): ", matchObj.group() else:     print "No match!" #......................................<br> import re   phone = "2004-959-559 # 这是一个国外电话号码"   # 删除字符串中的 Python注释 num = re.sub('#.*', "", phone) print "电话号码是: ", num   # 删除非数字(-)的字符串 num = re.sub('\D', "", phone) print "电话号码是 : ", num #....................................................<br> import re   def double(matched):     value = int(matched.group('value'))     print value     return str(value*2)   s = 'A223D23SSS#2E23236' print(re.sub('(?P<value>\d+)', double, s))     # 将匹配的数字乘于 2 def double(matched):     value = int(matched.group('value'))     return str(value * 2)     s = 'A23G4HFD567' print(re.sub('(?P<value>\d+)', double, s)) #......................................<br> import thread import time   def print_time(threadname,delay):     count = 0     while count < 5:         time.sleep(delay)         count += 1         print "%s: %s" %(threadname,time.ctime(time.time()))   try:     thread.start_new_thread(print_time,("Thread-1",2,))     thread.start_new_thread(print_time,("Thread-2",4,)) except:     print "Error: unable to start thread"   while 1:    pass #..............................................<br> import threading import time exitFlag = 0 class myThread(threading.Thread):     def __init__(self, threadID, name, counter):         threading.Thread.__init__(self)         self.threadID = threadID         self.name = name         self.counter = counter     def run(self):         print "Starting " + self.name         print_time(self.name, self.counter, 5)         print "Exiting" + self.name def print_time(threadName, delay, counter):     while counter:         if exitFlag:             print "退出线程"             threading.Thread.exit()         time.sleep(delay)         print "%s: %s" % (threadName,time.ctime(time.time()))         counter -=1   thread1 = myThread(1,"Thread-1", 1) thread2 = myThread(2,"Thread-2", 1)   thread1.start() thread2.start()   print "Exitting Main Thread"   #...................................................... import threading import time   class myThread(threading.Thread):     def __init__(self,threadID, name, counter):         threading.Thread.__init__(self)         self.threadID = threadID         self.name = name         self.counter = counter     def run(self):         print "Starting " + self.name         threadLock.acquire()         print_time(self.name, self.counter, 3)         threadLock.release() def print_time(threadName, delay, counter):     while counter:         time.sleep(delay)         print "%s: %s" %(threadName, time.ctime(time.time()))         counter -= 1 threadLock = threading.Lock() threads = []   thread1 = myThread(1, "Thread-1", 1) thread2 = myThread(2, "Thread-2", 2)   thread1.start() thread2.start()   threads.append(thread1) threads.append(thread2)   for t in threads:    t.join() print "Exiting Main Thread" #..........................................................<br> import Tkinter top = Tkinter.Tk() top.mainloop() #......................................................<br> from Tkinter import * root = Tk() li = ['C','python','php','html','SQL','java'] movie = ['CSS','jQuery','Bootstrap'] listb = Listbox(root) listb1 = Listbox(root) for item in li:     listb.insert(0,item)   for item in movie:     listb1.insert(1,item)   listb.pack() listb1.pack() root.mainloop() #.....................................................<br><br> #1,2,3,4组成多少种不同的三位数（个位，十位，百位数字各不相同） count = 0 for a in range(1,5):     for b in range(1,5):         for c in range(1,5):             if a != b and a != c and b != c:                 count += 1                 print a,b,c print "共%d种组合" %count #....................................................<br><br> while True:     Profit = raw_input("请输入本月的利润：")     if Profit.isdigit():         Profitint = int(Profit)           if Profitint <=100000:             bonus = Profitint * 0.1         elif Profitint > 100000 and Profitint < 200000:             bonus = (Profitint - 100000) * 0.075 + 100000 *0.1         elif Profitint >= 200000 and Profitint < 400000:             bonus = (Profitint - 200000) * 0.05 + 10000 +7500         elif Profitint >= 400000 and Profitint < 600000:             bonus = (Profitint - 400000) * 0.03 + 10000 + 7500 + 10000         elif Profitint >= 600000 and Profitint < 1000000:             bonus = (Profitint - 600000) * 0.015 + 10000 + 7500 + 10000+6000         else:             bonus = (Profitint - 1000000) * 0.01 + 10000 + 7500 + 10000+6000 + 3000         print bonus     elif Profit == 'q':         exit(0)     else:         print "您输入的内容不合法！" #''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' #判断输入的日期是一年种的第几天   print "please input Date:" while True:     year = raw_input("year:")     if year.isdigit() == 0:         print "输入的年份不合法,请重新输入！"     else:         yearint = int(year)         break while True:     month = raw_input("month:")     if month.isdigit() == 1:         monthint = int(month)         if 1<= monthint <=12:             break         else:             print "输入的月份不合法,请重新输入！"             continue     else:         print "输入的月份不合法,请重新输入！"         continue while True:     day = raw_input("day:")     if month.isdigit() == 1:         dayint = int(day)         if dayint in (1,3,5,7,8,10,12):             if 1<= dayint <=31:                 break             else:                 print "输入的日期不合法，请重新输入！"                 continue         elif dayint in (4,6,9,11):             if 1<= dayint <=30:                 break             else:                 print "输入的日期不合法，请重新输入！"                 continue         else:             if yearint%4 == 0 and yearint%100 != 0 or yearint%400 ==0:                 if 1<= dayint <= 29:                     break                 else:                     print "输入的日期不合法，请重新输入！"                     continue             else:                 if 1 <= dayint <= 28:                     break                 else:                     print "输入的日期不合法，请重新输入！"                     continue       else:         print "输入的日期不合法，请重新输入！"         continue   if yearint%4 == 0 and yearint%100 != 0 or yearint%400 ==0:     totalday= [31,60,91,121,152,182,213,244,274,305,335,366] else:     totalday = [31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365]   if int(month) == 1:     days = dayint else:     days = totalday[int(month)-2] + dayint print "这是今年的第 %d 天" % days #.......................................................... <br>#排序<br> l =[] for i in range(1,4):     x = int(raw_input('integer:'))     l.append(x) l.sort() print l #...............................................<br> # 使用递归 def fib(n):     if n == 1 or n == 2:         return 1     return fib(n - 1) + fib(n - 2)     # 输出了第10个斐波那契数列 print fib(10)   #................................................. a = [1,2,3,4,5] b = []   for i in range(0,len(a)):     b.append(a[i]) print b ''' #乘法口诀 ''' for i in range(1,10):     for j in range(1,i+1):         print "%d*%d=%d" %(i,j,i*j),     print #.................................................<br> import time myD = {1:'a',2:'b'} for key,value in dict.items(myD):     print key,value     time.sleep(1) #......................................................<br> import time print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))   time.sleep(1)   print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())) #......................................................<br> f1 = 1 f2 = 1 for i in range(1,22):     print "%14ld %14ld" %(f1,f2),     if(i % 3) == 0:         print " "     f1 = f1+f2     f2 = f1+f2 #................................................................<br> flag = 0 count = 0 for i in range(101,200):     for j in range(2,i):         if i % j == 0:             flag = 1     if flag == 0:         print i         count +=1     else:         flag = 0 print "total :%d " %count #.......................................................<br> for a in range(1,10):     for b in range(0,10):         for c in range(0,10):             if a**3 + b**3 + c**3 == c +b*10+a*100:                 print c +b*10+a*100 #...............................................<br> import datetime   if __name__ == "__main__":     print(datetime.date.today().strftime('%d/%m/%Y'))       time1 = datetime.date(1941,1,5)     print(time1.strftime('%d/%m/%Y'))       #在time1的时间上加一天     time2 = time1 + datetime.timedelta(days=1)     print(time2.strftime("%d/%m/%Y"))       time3 = time2.replace(month=time2.month+1)     print(time3.strftime('%d/%m/%Y')) #..........................................................<br> #计算输入字串中英文字母，空格，数字和其他字符的个数 alphacount = 0 digitcount = 0 spacecount = 0 elsecount = 0 string = raw_input("please input string:") for s in string:     if s.isdigit():         digitcount += 1     elif s.isalpha():         alphacount += 1     elif s.isspace():         spacecount += 1     else:         elsecount += 1   print "数字字符共%d个" % digitcount print "字母字符共%d个" % alphacount print "空字符共%d个" % spacecount print "其他字符共%d个" % elsecount #...................................................<br> num = int(raw_input("please input the number:")) amount = int(raw_input("please input the amount:")) total = 0 num1 = 0 for i in range(0,amount):      num1 += num*(10**i)      total = total + num1      print num1 print total #.................................................................<br> #一个数如果恰好等于它的因子之和，这个数就称为"完数"。例如6=1＋2＋3.编程找出1000以内的所有完数。 total = 0 a = [] for num in range(2,1001):     for i in range(1,num):         if num % i == 0:             total = total + i             a.append(i)       if total == num:         print total         print a     total = 0     a = [] #.............................................<br> num = 1 for i in range(1,10):     num = num*2+2 print num #....................................................<br> for a in ['x','y','z']:     for b in ['x', 'y', 'z']:         for c in ['x', 'y', 'z']:             if(a!=b)and(b!=c)and(c!=a) and (a!='x') and (c!='x') and (c!='z'):                 print 'a和%s比赛，b和%s比赛，c和%s比赛' %(a,b,c) #...........................................................<br> a1 = 2.0 a2 = 3.0 b1 = 1.0 b2 = 2.0 total = 0.0 for i in range(1,20):     if i == 1:         total = total + a1/b1+a2/b2     else:         temp = a1 + a2         a1 = a2         a2 = temp           temp = b1 + b2         b1 = b2         b2 = temp         total = total + a2 / b2 print total #.........................................   #翻转字串输出 def Reverse(str,len):     if len == 0:         return     print str[len-1],     len = len -1     Reverse(str,len) string = raw_input("please input string:") len = len(string) Reverse(string,len) #........................................................<br> def Age(n):     if n == 1:         return 10     else:         return Age(n-1)+2   print Age(5) #..........................................<br> num = int(raw_input("number:")) count = 0 n = num while True:     a = n%10     print a,     count += 1     n = n/10     if n == 0:         break print "此数是%d位数" % count #..................................................<br> #判断输入的数字是否为回文数 num = raw_input("number:") lenth = len(num) flag = True for i in range(lenth/2+1):     if num[i] != num [lenth-i-1]:         flag = False if flag == False:     print "%d不是回文数" % int(num) else:     print "%d是回文数" % int(num) #......................................................<br> Firstletter = raw_input("week:")   if Firstletter == "s" or Firstletter == "S":     Secondletter = raw_input("please input the second letter:")     if Secondletter == "u":         print "today is sunday!"     elif Secondletter == "a":         print "today is saturday!"     else:         print "data error!" elif Firstletter == "m" or Firstletter == "M":     print "totay is monday!" elif Firstletter == "T" or Firstletter == "t":     Secondletter = raw_input("please input the second letter:")     if Secondletter == "u":         print "today is Tuesday!"     elif Secondletter == "h":         print "today is Thursday!"     else:         print "data error!" elif Firstletter == "W" or Firstletter == "w":     print "today is Wednesday!" elif Firstletter == "F" or Firstletter == "f":     print "today is Friday!" else:     print "data error!" #................................................... <br>#倒序输出列表元素<br> a = ['one', 'two', 'three'] for i in a[::-1]:     print i ''' ''' def export():     L = [1,2,3,4,5]     s1 = ','.join(str(n) for n in L)     print s1 if __name__ == "__main__":     export() #..................................................... #设置文本颜色 class bcolors:     HEADER = "\033[95m"     OKBLUE = "\033[94m"     OKGREEN = "\033[91m"     WARNING = "\033[93m"     FAIL = '\033[91m'     ENDC = '\033[0m'     BOLD = '\033[1m'     UNDERLINE = '\033[4m' print bcolors.OKGREEN + "警告的颜色字体" + bcolors.ENDC #....................................................... <br>#二维数组 if __name__ == "__main__":     a = []     sum = 0.0     for i in range(3):         a.append([])  #列表里面包含列表形成二维数组         for j in range(3):             a[i].append(float(raw_input("input num:\n")))     for i in range(3):         sum += a[i][i]     print sum #输出二维数组 for i in range(3):     print a[i] #..........................................................<br> #给已经排序的列表中插入新的元素 num = int(raw_input("number:")) a = [1,3,4,5,12,13,23,34,45,56,0]#最后一个0作为占位符，以防止列表插入一个元素时越界 lenth = len(a)-1   if num >=a[lenth -1]:     a[lenth] = num else:     for i in range(lenth):         if num < a[lenth-i-1]:             a[lenth-i] = a[lenth-i-1]             a[lenth-i-1] = num print a<br>#...........................................................<br> a = [1,2,3,4,5] lenth = len(a) for i in range(lenth):     print a[lenth-i-1] ''' ''' X = [[12,7,3],     [4 ,5,6],     [7 ,8,9]]   Y = [[5,8,1],     [6,7,3],     [4,5,9]]   total = [[0,0,0],          [0,0,0],          [0,0,0]] for i in range(3):     for j in range(3):         total[i][j] = X[i][j] + Y[i][j] for i in range(3):     print total[i] #.................................................<br> MAXIMUM = lambda x,y : (x>y)*x + (x<y)*y MINMUM = lambda x,y:(x>y)*x + (x<y)*x if __name__ == '__main__':     a = 10     b = 20     print "The largar one is %d " % MAXIMUM(a,b)     print "The lower one is %d" % MINMUM(a,b)<br>#.................................................. if __name__ == "__main__":     from Tkinter import *     canvas = Canvas(width =800,height = 600,bg = "yellow")     canvas.pack(expand= YES,fill=BOTH)     k = 1     j = 1     for i in range(0,26):         canvas.create_oval(310-k,250-k,310+k,250+k,width=1)         k += j         j += 0.3     mainloop() #......................................................<br> if __name__ == '__main__':     import turtle     turtle.title("画圆")     while True:         turtle.setup(800,800,100,100)         pen=turtle.Turtle()         pen.color("blue")         pen.width(5)         pen.shape("turtle")         pen.speed(1)         pen.circle(100) #.........................................................<br> #画直线 if __name__ == "__main__":     from Tkinter import *       canvas = Canvas(width=300, height=300,bg = "green")     canvas.pack(expand=YES,fill=BOTH)     x0 = 263     y0 = 263     y1 = 275     x1 = 275     for i in range(19):         canvas.create_line(x0,y0,x0,y1,width=1, fill='red')         x0 = x0 - 5         y0 = y0 - 5         x1 = x1 + 5         y1 = y1 + 5     x0 = 263     y1 = 275     y0 = 263     for i in range(21):         canvas.create_line(x0,y0,x0,y1,fill='red')         x0 += 5         y0 += 5         y1 += 5         mainloop() #......................................................................<br> #画正方形 if __name__ == "__main__":     from Tkinter import *     root = Tk()     root.title('Canvas')     canvas = Canvas(root,width = 400,height = 400,bg = "yellow")     x0 = 263     y0 = 263     y1 = 275     x1 = 275     for i in range(19):         canvas.create_rectangle(x0,y0,x1,y1)         x0 -= 5         y0 -= 5         x1 += 5         y1 += 5     canvas.pack()     root.mainloop() #................................................................ #画椭圆 if __name__ == "__main__":     from Tkinter import *     x = 360     y = 160     top = y -30     bottom = y -30     canvas = Canvas(width = 400,height = 600,bg = 'white')     for i in range(20):         canvas.create_oval(250-top,250 - bottom,250+top,250+bottom)         top -= 5         bottom += 5     canvas.pack()     mainloop() #.....................................................................<br> import math class PTS:     def __init__(self):         self.x = 0         self.y = 0 points = []   def LineToDemo():     from Tkinter import *     screenx = 400     screeny = 400     canvas = Canvas(width = screenx,height = screeny,bg = 'white')       AspectRatio = 0.85     MAXPTS = 15     h = screeny     w = screenx     xcenter = w / 2     ycenter = h / 2     radius = (h - 30) / (AspectRatio * 2) - 20     step = 360 / MAXPTS     angle = 0.0     for i in range(MAXPTS):         rads = angle * math.pi / 180.0         p = PTS()         p.x = xcenter + int(math.cos(rads) * radius)         p.y = ycenter - int(math.sin(rads) * radius * AspectRatio)         angle += step         points.append(p)     canvas.create_oval(xcenter - radius,ycenter - radius,                        xcenter + radius,ycenter + radius)     for i in range(MAXPTS):         for j in range(i,MAXPTS):             canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)       canvas.pack()     mainloop() if __name__ == '__main__':     LineToDemo() #....................................................<br> def Maxnum(n,lenth):     max = n[0]     for i in range(lenth):         if n[i] > max:             max = n[i]             index = i     return index   def Minnum(n,lenth):     min = n[0]     for i in range(lenth):         if n[i] < min:             min = n[i]             index = i     return index   if __name__ == "__main__":     a = []     for i in range(5):         num = int(raw_input("number:"))         a.append(num)     print a     lenth = len(a)     maxindex = Maxnum(a,lenth)     minindex = Minnum(a,lenth)     a[0],a[maxindex] = a[maxindex],a[0]     a[lenth-1],a[minindex] = a[minindex],a[lenth-1]     print a #.........................................................<br> from collections import deque   m = 3 a = [1,2,3,4,5,6,7]   #7 个数 f = deque(a) f.rotate(m) print list(f) #.....................................................<br> if __name__ == "__main__":     a = [1,3,2]     b = [3,4,5]     a.sort()     print a     print a + b     a.extend(b) #连接两个列表     print a #...................................................... num = int(raw_input("number：")) sum = 0.0 for i in range(1,num+1):     if num%2 == 0 and i%2 == 0:         sum = sum + 1.0/i     elif num%2 != 0 and i%2 != 0:         sum = sum + 1.0/i print sum #............................................................<br> if __name__ == "__main__":     person = {"li":18,"wang":13,"zhang":20,"sun":30}     m = 'li'     for key in person.keys():         if person[m] < person[key]:             m = key print "%s,%d" %(m,person[m]) #..........................................................<br> if __name__ == '__main__':     str1 = raw_input('input string:\n')     str2 = raw_input('input string:\n')     str3 = raw_input('input string:\n')     print str1, str2, str3       if str1 > str2: str1, str2 = str2, str1     if str1 > str3: str1, str3 = str3, str1     if str2 > str3: str2, str3 = str3, str2       print 'after being sorted.'     print str1, str2, str3 #..................................................... my_lambda = lambda arg:arg+1 result = my_lambda(2) print result