1.while循环

 

age_of_sy=18

guess_age=input("guess age:")

count=0

while count<3:

  if guess_age==age_of_sy:

      print("yes,you are right!")

      break

  elif guess_age<age_of_sy:

      print("think it bigger")

   else:

     print("think it smaller")

  count+=1

  if count==3:

    continue_confirm=input("do you wang to keep trying?")

    if continue_confirm !="n":

      count=0

else:

print("you have tried too many times,please go away")

 

2.for循环

for i in range(0,10,2)  :  #步长为2，范围为0-10

    print("loop",i)

  for j in range(10):

    if j>5:

    break   #berak跳出本次循环

3.for 循环之continue

for i in range (10)

   if i<6:

  print("loop",i)

  else:

   continue  #continue是跳出本次循环进入下一循环。

  print（hehe...）