表達式for loop

最簡單的循環10次

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

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

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輸出：

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

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需求一：仍是上面的程序，可是遇到小於5的循環次數就不走了，直接跳入下一次循環

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

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需求二：仍是上面的程序，可是遇到大於5的循環次數就不走了，直接退出

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

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需求三：仍是上面的程序，可是每跳一個打印一個，打印完畢退出

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

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 加斷點測試continue用法

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

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兩個for循環

 

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

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

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總結：continue跳出本次循環，進入下一次循環，break結束當前當次整個循環。

 

用for代替剛剛的猜年齡程序：

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!!")

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 仍是猜年齡程序，要求每猜錯三次提示「還要不要繼續玩？」

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": #  不等於「n」繼續循環
                      count = 0

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