python#原创第13篇~while循环+答案

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2017-12-02 12:36:35 December Saturday the 48 week, the 336 day#原创第13篇~while循环#普通whilenum = 1     #num is numberwhile num <= 3:     #while执行后面语句块    print(num)      #每次循环让num加1    num += 1        #等价于num = num +12017-12-02 12:36:39 December Saturday the 48 week, the 336 day#原创第13篇~while循环#while和input函数robote = "\nplease talk to me, and I will repeat what you say:"robote += "\nEnter 'Q' to end the program.\n"   #用户输入Q程序结束words = ""while words != 'Q':    words = input(robote)    print(words)2017-12-02 13:04:09 December Saturday the 48 week, the 336 day#原创第13篇~while循环#while和else语句num = 1     #num is numberwhile num <= 3:     #while执行后面语句块    print(num)      #每次循环让num加1    num += 1        #等价于num = num +1else:    print("num is not less than 3")     #num 不再小于数字3了#只有当while为假，全部执行完成后才执行else后面的语句。2017-12-02 13:44:32 December Saturday the 48 week, the 336 day#原创第13篇~while循环#while和break语句k = 1while 1:            # 循环条件为1必定成立    if k > 5:       # 当i大于5时跳出循环        break       #k为6时候跳出while循环，不再输出k的值    print(k)        # 输出1~5    k += 1          #每循环一次，让k的值加1，等价于：k = k + 12017-12-03 17:59:59 December Sunday the 48 week, the 337 day#原创第13篇~while循环#while and continue'''i是奇数时，if条件成立，接着执行continue,接着跳过print(i)函数，返回去重新执行while条件语句i < 10i是偶数时候，if语句不成立，跳过continue语句，执行print(i)，然后返回去重新执行while条件语句i < 10'''i = 1while i < 10:       i += 1    if i%2 > 0:             continue    #     print(i)         # 输出双数2、4、6、8、102017-12-03 18:44:49 December Sunday the 48 week, the 337 day#原创第13篇~while循环#while和true and false语句robote = "\nplease talk to me, and I will repeat what you say:"robote += "\nEnter 'quit' to end the program.\n"   #用户输入Q程序结束condition = Truewords = ""while condition:    words = input(robote)       #words得到输入的字符    if words == "quit":        condition = True        #用户一旦输入quit，while循环就结束    else:        print(words)        #只要用户没有输入quit，就一直输出输入的内容2017-12-03 19:02:13 December Sunday the 48 week, the 337 day#原创第13篇~while循环#控制台运行python程序，ctrl + C 结束 while死循环while 1:        #条件始终成立，while将会被一直执行    print("I love Python")      #唯有Ctrl + C 让我不会再爱python2017-12-03 20:02:13 December Sunday the 48 week, the 337 day#原创第13篇~while循环#课后题：99乘法口诀i=1             #i是行数while i<=9:     #外边一层循环控制行数          j=1        #j是列数     while j<=i:    #里面一层循环控制每一行中的列数          nine_nine =j*i          print("%d*%d=%d"%(j,i,nine_nine), end="   ")                    #print("  ")          j+=1     print(i,"行结束")     #print("")     i+=11*1=1   1 行结束1*2=2   2*2=4   2 行结束1*3=3   2*3=6   3*3=9   3 行结束1*4=4   2*4=8   3*4=12  4*4=16  4 行结束1*5=5   2*5=10  3*5=15  4*5=20  5*5=25  5 行结束1*6=6   2*6=12  3*6=18  4*6=24  5*6=30  6*6=36  6 行结束1*7=7   2*7=14  3*7=21  4*7=28  5*7=35  6*7=42  7*7=49  7 行结束1*8=8   2*8=16  3*8=24  4*8=32  5*8=40  6*8=48  7*8=56  8*8=64  8 行结束1*9=9   2*9=18  3*9=27  4*9=36  5*9=45  6*9=54  7*9=63  8*9=72  9*9=81  9 行结束[Finished in 0.4s]
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