字符串操作练习：星座、凯撒密码、99乘法表、词频统计预处理

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

plaincode=input("明文：")
print("密文：")
x=ord(‘A‘)
y=ord(‘Z‘)
i=ord(‘a‘)
j=ord(‘z‘)
for k in plaincode:
    if x<= ord(k) <=y:
        print(chr(x+(ord(k)-x+3)%26),end=‘‘)
    elif i<= ord(k) <=j:
        print(chr(i+(ord(k)-i+3)%26),end=‘‘)
    else:
        print(k,end=‘‘)

name = input("请输入你的名字：")
print("格式输出：{0: ^4}".format(name))

year = input("请输入年份：")
gdp = float(input("请输入{}年的GDP：".format(year)))
print("中华人民共和国国内生产总值(GDP){0:,.2f}亿元({1}年)".format(gdp,year))

for i in range(1,10):
    for j in range(1,10):
        print("{}x{}={}".format(i,j,i*j),end=‘ ‘)
        if i==j:
            print("\n")
            break

s = ‘‘‘Living in the 21st century offers certain advantages,such as a higher
standard of living, but it also has some disadvantages, such as a polluted envir
onment.To begin with, most people now have more money for less hard work. They e
arn higher salaries than before and enjoy better social security, such as social
welfare for laid-off workers and disability insurance.Secondly, because of the a
dvance in medical technology which leads to better medical care and treatment,
people’s life expectancy is longer. Moreover, most people now can afford to buy
foods of high nutrition and enjoy their leisure time.‘‘‘
print(s)
word = input("请输入查询的单词：")
print("该单词出现的次数为：%d"%str(s).count(word))
for i in s:
    s=str(s).replace(","," ")
    s=str(s).replace("."," ")
    s=str(s).replace("?"," ")
    s=str(s).replace("!"," ")
    s=str(s).lower()
print(s)

import webbrowser as web
web.open_new_tab(‘http://news.gzcc.cn/html/xiaoyuanxinwen/‘)