1.字符串操作：& 2.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。

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]


# ID_add是身份证中的区域代码，如果有一个行政区划代码字典，就可以用获取大致地址#

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')

# 此部分应为错误判断，如果错误就不应有上面的输出，如何实现？#
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')

运行结果如下

凯撒密码编码与解码

MAX_KEY_SIZE = 26
def getMode():
    while True:
        print('请选择加密或解密模式,或者选择暴力破解：')
        print('加密:encrypt(e)')
        print('解密:decrypt(d)')
        print('暴力破解:brute(b)')
        mode = input().lower()
        if mode in 'encrypt e decrypt d brute b'.split():
            return mode
        else:
            print('请输入"encrypt"或"e"或"decrypt"或"d"或"brute"或"b"!')
def getMessage():
    print('请输入你的信息：')
    return input()
def getKey():
    key = 0
    while True:
        print('请输入密钥数字(1-%s)' % (MAX_KEY_SIZE))
        key = int(input())
        if (key >=1 and key <= MAX_KEY_SIZE):
            return key
def getTranslatedMessage(mode, message, key):
    if mode[0] == 'd':
        key = -key
    translated = ''
    for symbol in message:
        if symbol.isalpha():
            num = ord(symbol)
            num += key
            if symbol.isupper():
                if num > ord('Z'):
                    num -= 26
                elif num < ord('A'):
                    num += 26
            elif symbol.islower():
                if num > ord('z'):
                    num -= 26
                elif num < ord('a'):
                    num += 26
            translated += chr(num)
        else:
            translated += symbol
    return translated
mode = getMode()
message = getMessage()
if mode[0] != 'b':
    key = getKey()
print('你要翻译的信息是:')
if mode[0] != 'b':
    print(getTranslatedMessage(mode, message, key))
else:
    for key in range(1, MAX_KEY_SIZE + 1):
        print(key, getTranslatedMessage('decrypt', message, key))

网址观察与批量生成

print(r"搜索结果如下");
url="https://list.jd.com/list.html?tid=1006238"
s="&bcoffset=3&ntoffset=3&p4ppushleft=1%2C48&s="
print("第1页网址为{}".format(url));
for i in range(5):
    arg=url+s+str(i*44);
    print("第{}页网址为{}".format(i+2,url));



##运行结果如下

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，保存为utf8文件。
• 从文件读出字符串。
• 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。

#英文歌词：
str1='''I will not make the same mistakes that you did 
I will not let myself cause my heart so much misery 
I will not break the way you did 
You fell so hard 
I learned the hard way, to never let it get that far 
-
Because of you 
I never stray too far from the sidewalk 
Because of you 
I learned to play on the safe side 
So I don't get hurt 
Because of you 
I find it hard to trust 
Not only me, but everyone around me 
Because of you 
I am afraid 
-
I lose my way 
And it's not too long before you point it out 
I cannot cry 
Because I know that's weakness in your eyes 
I'm forced to fake a smile, a laugh 
Every day of my life 
My heart can't possibly break 
When it wasn't even whole to start with 
-
Because of you 
I never stray too far from the sidewalk 
Because of you 
I learned to play on the safe side 
So I don't get hurt 
Because of you 
I find it hard to trust 
Not only me, but everyone around me 
Because of you 
I am afraid 
-
I watched you die 
I heard you cry 
Every night in your sleep 
I was so young 
You should have known better than to lean on me 
You never thought of anyone else 
You just saw your pain 
And now I cry 
In the middle of the night 
Over the same damn thing 
-
Because of you 
I never stray too far from the sidewalk 
Because of you 
I learned to play on the safe side so I don't get hurt 
Because of you 
I tried my hardest just to forget everything 
Because of you 
I don't know how to let anyone else in 
Because of you 
I'm ashamed of my life because it's empty 
Because of you 
I am afraid 
-
Because of you'''
#把单词全部变成小写
s1=str1.lower()
print(s1)
#去掉空格
str1=str1.lstrip()
print(str1)
#将歌词的每个单词分隔组成列表形式
print("将歌词的每个单词分隔组成列表形式:")
strList=str1.split()
print(strList)
#计算单词出现的次数
print("计算单词出现的次数:")
strSet=set(strList)
for word in strSet:
   print(word,strList.count(word))

运行结果如下