for

range 此函数可以生成一个数据集合列表

range(起始:结束:步长)步 长不能为0

sum=1

for data in range(0,101):

sum+=data

pass

print(“sum=%d”%sum)

break和cont inue

break 代表中断结束

#满足条件直接的结束本层循环

continue :结束本次循环，继续的进行下次循环(当continue的条件满足的时候

本次循环剩下的语句将不在执行

#后面的循环继续)
#这两个关键字只能用在循环中

sum =0

for i in range(1,51):

if sum>100:

print(‘循环执行到%d就打印’%i)

break

pass

sum+=i

pass

print(“sum=%d”%sum)

for i in range(1,100):

if i%2==0:

continue

print(‘在continue的后面不会执行’)

pass

print(i)

for i in ‘a b c d’:

if i ==‘b’:

# break #到a结束

continue #跳出本次

#for循环嵌套

for i in range(1,10):

for j in range(1,i+1):

print("%d*%d=%d"%(i,j,i*j),end=’ ')

pass

print()

pass

for i in range(1,11):

print(i,end=’ ')

if i >=5:

break #如果执行break就不会执行else

pass

else:

print(‘完毕’)

while----else

#i=1

while i<=10:

print(i)

if i >=5:

print(‘NO’)

break

i+=1

pass

else:

print(‘yes’)

i=0

while i<=3:

age=int(input(‘猜age’))

if age==20:

print(‘yes’)

break #满足if就终止

pass

else:

print(‘no’)

pass

i+=1

if i==3:

xuanze=input(‘y/n?’)

if xuanze==‘y’ or xuanze==‘Y’:

i=0#初始这个值

pass

elif xuanze==‘n’ or xuanze==‘N’:

break

pass

else:

break

pass