1.字符串操作：
（1）解析身份证号：
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#
print("出生地为："+ID_add)
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‘)
解析结果：
（2）凯撒密码编码与解码
plaincode=input(‘letter:‘)
for i in plaincode:
print(chr(ord(i)+3),end=‘‘)
结果:
(3)网址观察与批量生成
for i in range(2,10):
url=‘http://news.gzcc.cn/html/xiaoyuanxinwen/{}.html‘.format(i)
print(url)
打开网址：
import webbrowser as web
url=‘http://news.gzcc.cn/html/xiaoyuanxinwen/‘
web.open_new_tab(url)
for i in range(2,4):
web.open_new_tab(‘http://news.gzcc.cn/html/xiaoyuanxinwen/‘+str(i)+‘.html‘)
网址观察结果：
2.英文词频统计预处理
代码：
str=‘‘‘I‘m a big, big girl in a big, big world
It‘s not a big, big thing if you leave me
But I do, do feel that I do, do will miss you much
Miss you much ‘‘‘
str=str.lower()
s=‘,.!?‘
for c in s:
str = str.replace(c, "")
print(str.split())
print(str.count(‘big‘))
结果：
3.文件操作
同一目录读文件代码：
f=open(‘yw.txt‘,‘r‘,encoding=‘utf8‘) text=f.read() f.close() print(text)
绝对路径读文件代码：
f=open(r‘C:\Users\Administrator\PycharmProjects\bd\venv\lj\xd.txt‘,‘r‘,encoding=‘utf8‘) text=f.read() f.close() print(text)
相对路径读文件代码：
f=open(r‘..\venv\lj\xd.txt‘,‘r‘,encoding=‘utf8‘) text=f.read() f.close() print(text)
读取文件内容结果：
凯撒密码：
file=open("caesar.txt")
caesar=file.read()
print("加密前的密码：",caesar)
cipher=‘‘;
jiemi=‘‘;
for i in caesar:
cipher=cipher+chr(ord(i)+3);
print("加密后的密码：",cipher)
file=open("cipher.txt",‘w‘)
file.write(cipher)
file.close()
加密结果：
加密前文件：
加密后文件：
4.函数定义
def get_text():
plaincode = ‘abcd‘
cipher=‘‘
for i in plaincode:
cipher=cipher+chr(ord(i) + 3)
return cipher
bigstr = get_text()
print(bigstr)
def get_text():
plaincode = ‘defg‘
cipher=‘‘
for i in plaincode:
cipher=cipher+chr(ord(i) -3)
return cipher
bigstr = get_text()
print(bigstr)
def get_text():
with open(‘yw.txt‘, ‘r‘, encoding=‘utf8‘,errors=‘ignore‘) as f:
text = f.read()
return text
bigstr = get_text()
print(bigstr)
原文：https://www.cnblogs.com/lirou/p/10497360.html