字符串、文件操作，英文词频统计预处理

解析身份证号：

 

 

代码：ID = input('请输入十八位身份证号码: ')
if len(ID) == 18:
    print("你的身份证号码是 " + ID)
else:
    print("错误的身份证号码")

ID_add = ID[0:6]
ID_birth = ID[6:14]
ID_sex = ID[14:17]
ID_check = ID[17]



year = ID_birth[0:4]
moon = ID_birth[4:6]
day = ID_birth[6:8]
print("生日: " + year + '年' + moon + '月' + day + '日')

if int(ID_sex) % 2 == 0:
    print('性别：女')
else:
    print('性别：男')


W = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
ID_num = [18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2]
ID_CHECK = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2']
ID_aXw = 0
for i in range(len(W)):
    ID_aXw = ID_aXw + int(ID[i]) * W[i]

ID_Check = ID_aXw % 11
if ID_check == ID_CHECK[ID_Check]:
    print('正确的身份证号码')
else:
    print('错误的身份证号码')

 

 

凯撒密码编码与解码：

 

 

代码：plaincode=input('')
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='')

网址观察与批量生成：

 

 

 

代码：for i in range(2, 4):
    url='http://news.gzcc.cn/html/xiaoyunxinwen/{}.html'.format(i);
    print(url);

import webbrowser as web #引入第三方库，并用as取名
url='http://news.gzcc.cn/html/xiaoyunxinwen/'
web.open_new_tab(url)
for i in range(2,4):
    web.open_new_tab('http://news.gzcc.cn/html/xiaoyunxinwen/'+str(i)+'.html')

 

2.英文词频统计预处理

• 下载一首英文的歌词或文章或小说

 

 

• 将所有大写转换为小写
• 将所有其他做分隔符（,.？！）替换为空格
• 分隔出一个一个的单词
• 并统计单词出现的次数。

 

 

代码：import os
from collections import Counter

# 假设要读取文件名为read，位于当前路径
filename = 'read.txt'
# 当前进程工作目录
dirname = os.getcwd()
fname = os.path.join(dirname, filename)

with open(fname) as f:
    s = f.read()

counter = Counter(s.replace('\n', ' ').split(' '))

# 格式化要输出的每行数据，尾占8位，首占18位
def geshi(a, b):
    return "{:<18}""{:>8}".format(a,b) + '\n'

title = geshi('词', '频率')
results = []
# 要输出的数据，每一行由：词、频率+'\n'构成，序号=List.index(element)+1
for w, c in counter.most_common():
    results.append(geshi(w, c))

# 将统计结果写入文件write.txt中
writefile = 'write.txt'
wpath = os.path.join(dirname, writefile)
with open(wpath, 'w') as f:
    f.write(''.join([title] + sorted(results)))