字符串操作练习：星座、凯撒密码、99乘法表

for i in range(12):
    print(chr(9800+i),end=‘\\‘)

plaincode=input(‘明文:‘)
print(‘密文:‘,end=‘‘)
s=ord(‘a‘)
t=ord(‘z‘)
for i in plaincode:
    if s<= ord(i)<=t:
        print(chr(s+(ord(i)-s+3)%26),end=‘‘)
    else:
        print(i,end=‘‘)

name=input(‘输入姓名：‘)
print(‘你的名字：{0:‘ ‘^4}‘.format(name))

print(‘中华人民共和国国内生产总值（GDP）：{0:,.2f}亿元（{1}年）‘.format(689136.89,"2015"))

for x in range(1,10):
    for y in range(1,x+1):
        print(‘{}*{}={}‘.format(x,y,x*y),end=‘ ‘)
    print(‘\n‘)