字符串操作、文件操作，英文词频统计预处理

1.字符串操作：

解析身份证号：生日、性别、出生地等。

代码

def get_id_code(id):
    province = id[0:2]
    city = id[2:4]
    county = id[4:6]
    year = id[6:10]
    month = id[10:12]
    day = id[-6:-4]
    SN = id[-4:-1]
    if int(id[-2]) %2 != 1:
        sex = '女'
    else:
        sex = '男'
    check = id[-1]
    print("地址为：{}省，{}市，{}县，生日为：{}年{}月{}日,顺序号为{},性别为{},校验码为{}".format(province,city,county,year,month,day,SN,sex,check))
id = input("请输入身份证号码：")
get_id_code(id)

运行结果

凯撒密码编码与解码

代码

def encoding(code):
    print("加密前:{}".format(code))
    print("加密后:",end="")
    for x in range(len(code)):
        print(chr(ord(code[x]) + 3), end='')
def decoding(code):
    print("解密前:{}".format(code))
    print("解密后:",end="")
    for x in range(len(code)):
        print(chr(ord(code[x]) - 3), end='')
code = input("请输入要加密的编码：")
way = int(input("请输入要运行的方法(1为加密，2为解密)"))
if (way == 1):
    encoding(code)
if (way == 2):
    decoding(code)

运行结果

网址观察与批量生成

代码

def site_observation(url):
    for i in range(1,10):
        print(url + '{}.html'.format(i))
site_observation('http://news.gzcc.cn/html/xiaoyuanxinwen/')

运行结果

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 string
text=''' Remembering me,
　　Discover and see
　　All over the world,
　　She's known as a girl
　　To those who a free,
　　The mind shall be key
　　Forgotten as the past
　　'Cause history will last
　　God is a girl,
　　Wherever you are,
　　Do you believe it, can you recieve it?
　　God is a girl,
　　Whatever you say,
　　Do you believe it, can you recieve it?
　　God is a girl,
　　However you live,
　　Do you believe it, can you recieve it?
　　God is a girl,
　　She's only a girl,
　　Do you believe it, can you recieve it?
　　She wants to shine,
　　Forever in time,
　　She is so driven, she's always mine
　　Cleanly and free,
　　She wants you to be
　　A part of the future,
　　A girl like me
　　There is a sky,
　　Illuminating us, someone is out there
　　That we truly trust
　　There is a rainbow for you and me
　　A beautiful sunrise eternally
　　God is a girl
　　Wherever you are,
　　Do you believe it, can you recieve it?
　　God is a girl
　　Whatever you say,
　　Do you believe it, can you recieve it?
　　God is a girl
　　However you live,
　　Do you believe it, can you recieve it?
　　God is a girl
　　She's only a girl,
　　Do you believe it, can you recieve it?
 '''
for c in string.punctuation:
    text = text.replace(c," ")
text = text.lower()
text = text.split()
count = {}
for i in text:
    if i not in count:
       count[i] = 1
    else:
       count[i] +=1
print(count)

运行结果

3.文件操作

• 同一目录、绝对路径、相对路径
• 凯撒密码：从文件读入密函，进行加密或解密，保存到文件。
• 词频统计：下载一首英文的歌词或文章或小说，保存为utf8文件。从文件读入文本进行处理。

凯撒密码

代码

def encoding():
    f1 = open("file.txt","r",encoding='utf-8')
    f2 = open("code.txt","w",encoding='utf-8')
    code = f1.read()
    print("加密：")
    for x in range(len(code)):
        print(chr(ord(code[x]) + 3),end='')
        f2.write(chr(ord(code[x]) + 3))
    f1.close()
    f2.close()
def decoding():
    f1 = open("code.txt", "r",encoding='utf-8')
    f2 = open("file.txt", "w",encoding='utf-8')
    code = f1.read()
    print("\n解密：")
    for x in range(len(code)):
        print(chr(ord(code[x])-3),end='')
        f2.write(chr(ord(code[x]) - 3))
    f1.close()
    f2.close()
encoding()
decoding()

运行结果

词频统计

代码

import string
def count():
    f = open("count.txt","r",encoding='utf-8')
    text = f.read()
    f.close()
    text = text.lower()
    for c in string.punctuation:
        text = text.replace(c," ")
    text = text.lower()
    text = text.split()
    count = {}
    for i in text:
        if i not in count:
           count[i] = 1
        else:
           count[i] +=1
    print(count)
count()

运行结果

4.函数定义

加密函数

def encoding():
    f1 = open("file.txt","r",encoding='utf-8')
    f2 = open("code.txt","w",encoding='utf-8')
    code = f1.read()
    print("加密：")
    for x in range(len(code)):
        print(chr(ord(code[x]) + 3),end='')
        f2.write(chr(ord(code[x]) + 3))
    f1.close()
    f2.close()

解密函数

def decoding():
    f1 = open("code.txt", "r",encoding='utf-8')
    f2 = open("file.txt", "w",encoding='utf-8')
    code = f1.read()
    print("\n解密：")
    for x in range(len(code)):
        print(chr(ord(code[x])-3),end='')
        f2.write(chr(ord(code[x]) - 3))
    f1.close()
    f2.close()

读文本函数

def count():
    f = open("count.txt","r",encoding='utf-8')
    text = f.read()
    f.close()
    text = text.lower()
    for c in string.punctuation:
        text = text.replace(c," ")
    text = text.lower()
    text = text.split()
    count = {}
    for i in text:
        if i not in count:
           count[i] = 1
        else:
           count[i] +=1
    print(count)