r=range(1,10)
print(r[1])

for i in  r:
    print(i)

r1=range(10,20,2)

print(r1[0:3])


str="lovepython"
for i in range(0,len(str)):
    letter=str[i]
    print(letter)


# 斐波那契数列(50位)
list=[]
for i in  range(0,50):#循环五十次
    if i==0 or i==1:
        list.append(1)
    else:
        list.append(list[i-1]+list[i-2])

print(list)