01-while循环

# 这个i主要是控制循环次数的i = 0while 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 = 0my_sum = 0while i <= 100:    print(i)    # my_sum : + 0    #          + 1    #          + 2    my_sum += i    i += 1print(my_sum)

03-1到100之间的偶数累加和

i = 0my_sum = 0while 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 += 1print(my_sum)

04-练习

i = 0while 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 += 1

07-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 = 0for i in range(0, 101):    my_num += iprint(my_num)

09-循环版本的游戏

import random# 1.   设置两个玩家 player computer# 2.   player: 从控制台输⼊要出的拳 ⽯头(1)／剪⼑(2)／布(3)# 3.   computer: 电脑 随机 出拳i = 0while i < 5:    player = int(input("请出的拳 ⽯头(1)／剪⼑(2)／布(3):"))    computer = random.randint(1, 3)    # 4.   player和computer⽐较胜负    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continue

i = 1while i <= 7:    if i == 4:        print("有不吉利的数字")        i += 1        continue    print(i)    i += 1

13-while实现break

import random# 1.   设置两个玩家 player computer# 2.   player: 从控制台输⼊要出的拳 ⽯头(1)／剪⼑(2)／布(3)# 3.   computer: 电脑 随机 出拳while True:    player = int(input("请出的拳 ⽯头(1)／剪⼑(2)／布(3)/退出(0):"))    computer = random.randint(1, 3)    # 4.   player和computer⽐较胜负    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

# 10num = 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

# 13num = 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elsei = 0while i < 10:    if i == 4:        print("有不吉利的数字")        break    print(i)    i += 1else:    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elsefor 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")