表达式for loop

最简单的循环10次

#-*- coding: utf-8 -*-
#Author = "zero"

for i in range(10):
       print("loop:",i)

输出：

loop: 0
loop: 1
loop: 2
loop: 3
loop: 4
loop: 5
loop: 6
loop: 7
loop: 8
loop: 9

需求一：还是上面的程序，但是遇到小于5的循环次数就不走了，直接跳入下一次循环

for i in range(10):
    if i<5:
        continue #不往下走了,直接进入下一次loop
    print("loop:", i )

需求二：还是上面的程序，但是遇到大于5的循环次数就不走了，直接退出

for i in range(10):
    if i>5:
        break #不往下走了,直接跳出整个loop
    print("loop:", i )

需求三：还是上面的程序，但是每跳一个打印一个，打印完毕退出

for i in range(0,10,2):
       print("loop ",i)

 加断点测试continue用法

for i in range(0,10):
     if i < 3:
           print("loop ",i)
     else:
           continue
      print("hehe......")

两个for循环

 

for i in range(10):
     print("-------------",i)
     for j in range(10):
     print(j)

 

for i in range(10):
     print("-------------",i)
     for j in range(10):
     print(j)
     if j>5:
          break

总结：continue跳出本次循环，进入下一次循环，break结束当前当次整个循环。

 

用for代替刚刚的猜年龄程序：

age_of_oldboy = 28

for i in range(3):

       guess_age == int(input("guess age:"))
       if guess_age == age_of_oldboy:
             print("yes, you got it.")
             break
       elif guess_age < age_of_oldboy:
             print("think bigger!")
       else:
             print("think smaller......")
else:
       print("you have tried too many times..funck off!!")

 还是猜年龄程序，要求每猜错三次提示“还要不要继续玩？”

age_of_oldboy = 28

count = 0
while count < 3:
        guess_age = in(input("guess age:"))
        if guess_age == age_of_oldboy :
              print("yes, you got it.")
              break
         elif guess_age < age_of_oldboy:
               print("think bigger!")
         else:
               pirnt("think smaller......")
          count +=1
          if count == 3
              countine_confirm = input("do you want to keep guessing..?")  
               if countine_confirm !="n": #  不等于“n”继续循环
                      count = 0