循環：while，for

for 循環：

for i in range（0,10,2）:

循環體

備註：range裏面的2，是步長，就是 i 取值為：0 ，2,4,6,8；默認為1，for i in range（10）==for i in range （0,10）==for i in range （0,10，1）

結束循環：break：結束當前循環

continue：跳出本次循環，進入下一次循環

寫個循環：猜一個數字的大小

思路：給出一個數字猜大小，當猜的數字大於給出的數字，返回猜的數字過大；當猜的數字小於給出的數字，則返回猜的數字過小，當猜的數字等於給出的數字，則返回成功

猜的次數限制為3次，當第三次還猜不對的時，詢問是否繼續猜字遊戲，當輸入非‘n’和‘N’時，可以繼續猜三次。

good_number=57
guess_count=0
while guess_count<3:
    guess_number=int(input(‘Please input your guess_number: ‘))
    if guess_number==good_number:
        print(‘Good!!!You got it !!!‘)
        break
    elif guess_number<good_number:
        print(‘Too bad!!!You guessed it was small.‘)
    else:
        print(‘Too bad!!!You guessed it was big.‘)

    guess_count+=1

    if guess_count==3:
        print(‘You have guessed wrong three times,do you want to keep guessing...‘)
        continue_game=input(‘If you want to continue playing,you can enter any character or enter directly;\n‘
                            "If you do not want to continue playing, please enter ‘n ‘.\n")
        if continue_game!=‘n‘and continue_game!=‘N‘:
            guess_count=0

python之循環1