第13节 FOR循环

for i in range(10): //循环10次，每次加1 赋值给i
print("loop",i)

输出结果
loop 0
loop 1
loop 2
loop 3
loop 4
loop 5
loop 6
loop 7
loop 8
loop 9

只打印偶数

for i in range(0,10,2): //循环10次，每次加1 赋值给i
print("loop",i)

输出结果
loop 0

loop 2

loop 4

loop 6

loop 8

隔2个打印一个
for i in range(0,10,3): //循环10次，每次加1 赋值给i
print("loop",i)

输出结果
loop 0

loop 3

loop 6

loop 9

例1：

age_of_oldboy=56

for i in range(3):
guess_age=int(input("guess_age:"))
if age_of_oldboy==guess_age:
print("yes,you got it")
break
elif age_of_oldboy>guess_age:
print("think smaller")
else:
print("think older")
else:
print("you have tried too many times!")

例2：age_of_oldboy=56
count=0
while count<3 :
guess_age=int(input("guess_age:"))
if age_of_oldboy==guess_age:
print("yes,you got it")
break
elif age_of_oldboy>guess_age:
print("think smaller")
else:
print("think older")
count+=1
if count==3: //进行判断
continue_confirm=input("do you want to try again?")
if continue_confirm!="n": //等于n的时候退出，不等于n
count=0 //进行重置

第13节 FOR循环

原文：https://www.cnblogs.com/googlewang/p/10665426.html