从零开始学Python（三）while循环breakcontine

　　01-while循环# 这个i主要是控制循环次数的 i = 0  while i <= 100:     # print(＂我错了＂)     print(i)     # 控制循环次数     i += 1  02-1到100之间的累加和i = 0 my_sum = 0  while i <= 100:     print(i)     # my_sum : + 0     #          + 1     #          + 2     my_sum += i     i += 1  print(my_sum)  03-1到100之间的偶数累加和i = 0 my_sum = 0  while i <= 100:     # 在这里 i对2取余 如果是为0 证明这个i是一个偶数     if i % 2 == 0:         print(i)         my_sum += i      i += 1  print(my_sum)    04-练习i = 0  while i <= 10:     i += 1     print(i)    05-打印正方形# * * * * * # * * * * * # * * * * * # * * * * * # * * * * *   # 正方形 i = 0   # 执行5遍打印 * * * * * while i < 5:     # 打印 * * * * *     j = 0     while j < 5:         print(＂*＂, end=＂ ＂)         j += 1      # 换行的     print()      i += 1   06-三角形# * # * * # * * * # * * * * # * * * * *  # i外层循环控制了 行数 # j内层循环控制了 每一行的星星个数 # 正方形 i = 0   # 执行5遍打印 * * * * * while i < 5:     # 打印 * * * * *     j = i     while j < 5:         print(＂*＂, end=＂ ＂)         j += 1      # 换行的     print()      i += 107-for循环# 从键盘获取一个字符串 # 判断这个字符串里是否有不吉利的数字 data = ＂1234567＂  for i in data:     if i == ＂4＂:         print(＂有不吉利的数字＂)     print(i)08-range函数# 自动格式化补齐 # win: alt + ctrl + L # mac: alt + command + L  # randint(0,10) ==> 0 ,1 ,2 ... 10 # 大多数情况下python中涉及到范围的函数 # range(0, 10)  ==> 0 ,1 ,2 ... 9 包头不包尾 for i in range(0, 10):     print(i)  my_num = 0 for i in range(0, 101):     my_num += i  print(my_num)  09-循环版本的游戏import random  # 1.   设置两个玩家 player computer # 2.   player: 从控制台输 要出的拳  头(1)／剪 (2)／布(3) # 3.   computer: 电脑 随机 出拳  i = 0 while i < 5:     player = int(input(＂请出的拳  头(1)／剪 (2)／布(3):＂))     computer = random.randint(1, 3)      # 4.   player和computer 较胜负     if (player == 1 and computer == 2) or (player == 2 and computer == 3) or (player == 3 and computer == 1):         print(＂恭喜你胜利了＂)     elif player == computer:         print(＂平局 别走 决战到天亮＂)     else:         print(＂你不行＂)      i += 1  10-break# 1. break可以终止循环 # 2. break终止的循环是离他最近的循环 num = ＂1234567＂   for i in num:     if i == ＂4＂:         print(＂不吉利的数字＂)         # 终止循环         break     print(i)11-continue# 1. continue 终止当前循环 继续剩余的循环 # 2. continue 在continue终止的循环中 continue以下的代码都不会被执行 # 3. break和continue他们都是和循环结合使用的 不会单独使用 num = ＂1234567＂   for i in num:     if i == ＂4＂:         print(＂不吉利的数字＂)         # 终止当前循环 继续剩余的循环         continue     print(i)  print(123)12-while实现continuei = 1  while i <= 7:     if i == 4:         print(＂有不吉利的数字＂)         i += 1         continue     print(i)     i += 1  13-while实现breakimport random  # 1.   设置两个玩家 player computer # 2.   player: 从控制台输 要出的拳  头(1)／剪 (2)／布(3) # 3.   computer: 电脑 随机 出拳 while True:     player = int(input(＂请出的拳  头(1)／剪 (2)／布(3)/退出(0):＂))     computer = random.randint(1, 3)      # 4.   player和computer 较胜负     if (player == 1 and computer == 2) or (player == 2 and computer == 3) or (player == 3 and computer == 1):         print(＂恭喜你胜利了＂)     elif player == computer:         print(＂平局 别走 决战到天亮＂)     elif player == 0:         break     else:         print(＂你不行＂)   14-案例# 10 num = int(input(＂请输入您的数字:＂))  for i in range(1, num + 1):     if i % 7 == 0:         continue      if i % 10 == 7:         continue      print(i)  15-作业# 13 num = int(input(＂请输入一个数字：＂)) if num == 1 or num == 0:     print(＂%d 不是素数也不是合数＂ % num ) else:     i = 2     while i < num:         if num % i == 0:             print(＂%d不是素数＂%num)             break         i += 1     else:         print(＂%d是素数＂%num)16-while_else# while_else # else什么时候会执行: # 只要在while循环执行完就会执行else i = 0  while i < 10:     if i == 4:         print(＂有不吉利的数字＂)         break     print(i)     i += 1 else:     print(＂没有不吉利的数字＂)  17-for_else# while_else # else什么时候会执行: # 只要在while循环执行完就会执行else for i in range(10):     if i == 4:         print(＂有不吉利的数字＂)         break     print(i) else:     print(＂没有不吉利的数字＂)