1 import re
 2 
 3 # re.match只匹配字符串的开始，如果字符串开始不符合正则表达式，则匹配失败，函数返回None
 4 print(re.match("www","wwwwccc").group())   #在起始位置匹配
 5 print(re.match("www","wcccwww"))           #不在起始位置匹配，返回None
 6 
 7 # re.search扫描整个字符串并返回第一个成功的匹配
 8 print(re.search("haha","woshihahanishishui").group())
 9 
10 # re.findall从左到右扫描字符串，按顺序返回匹配，如果无匹配结果则返回空列表
11 print(re.findall("\d","one1two2three3four4"))
12 print(re.findall("\d","onetwothreefour"))
13 
14 # sub用于替换字符串中的匹配项
15 print(re.sub("g..t","good","goot geet up"))
16 # split返回切割后的列表
17 print(re.split("\+","123+456*789+abcd"))

1 # [‘AD123453‘, ‘AC342123‘, ‘AR343212‘]
2 # [A-Z]{2}\d{6}
3 
4 # ^(13|14|15|17|18)\d{9}
5 # ^1[34578]\d{9}

 1 import mysql.connector
 2 config = {
 3     "host":"127.0.0.1",
 4     "user":"root",
 5     "passwd":"vertrigo",
 6     "port":3306,
 7     "db":"test",
 8     "charset":"utf8"
 9 }
10 
11 try:
12     db = mysql.connector.connect(**config)
13 except mysql.connector.Error as e:
14     print("连接数据库失败！",str(e))

 1  2 cursor = db.cursor(buffered=True)   #buffered=True会把结果集保存到本地并一次性返回，这样可以提高性能
 3 try:
 4     #第一种：直接字符串插入方式
 5     # sql_insert1="insert into student (name, age) values (‘xiao‘, 27)"
 6     # cursor.execute(sql_insert1)
 7 
 8     #第二种：元组连接插入方式
 9     sql_insert2="insert into student (name, age) values (%s, %s)"
10     #此处的%s为占位符，而不是格式化字符串，所以age用%s
11     # data=http://www.mamicode.com/(‘xiaoqiang‘,18)
12     # cursor.execute(sql_insert2,data)
13     data = http://www.mamicode.com/[("xiao",20),
14             ("xian",25),
15             ("rourou",27),
16             ("juju",28)]
17     cursor.executemany(sql_insert2,data)
18 
19     #如果表引擎为Innodb，执行完成后需执行commit进行事务提交
20     db.commit()
21     #cursor.execute(‘commit‘)
22 except mysql.connector.Error as e:
23     print(‘插入失败！‘, str(e))
24 finally:
25     cursor.close()
26     db.close()

 1 cursor = db.cursor(buffered=True)
 2 try:
 3     sql_del = "delete from student where name=%s and age=%s"
 4     data_del = [
 5         ("cui",28),
 6         ("hao",27)]
 7     cursor.executemany(sql_del,data_del)
 8     db.commit()
 9 except mysql.connector.Error as e:
10     print("删除数据失败！",str(e))
11 finally:
12     cursor.close()
13     db.close()

 1 cursor = db.cursor(buffered=True)
 2 try:
 3     sql_update = "update student set age = 28 where name=‘kai‘"
 4     cursor.execute(sql_update)
 5     db.commit()
 6 except mysql.connector.Error as e:
 7     print(‘修改数据失败‘,str(e))
 8 finally:
 9     cursor.close()
10     db.close()

 1 cursor = db.cursor(buffered=True)
 2 try:
 3     # sql_select1 = "select * from student where age>%s"
 4     # cursor.execute(sql_select1,(1,))
 5 
 6     sql_select2 = "select * from student where age>%s"
 7     cursor.execute(sql_select2,(26,))
 8     datas1 = cursor.fetchall()         #如果在后加上[1]代表是取第一条数据
 9 
10     cursor.execute(sql_select2,(20,))
11     datas2 = cursor.fetchone()[1]      #如果在后加上[1]代表是取第一个字段
12     datas3 = cursor.fetchmany(5)
13 
14     print(datas1)
15     print(datas2)
16     print(datas3)
17 except mysql.connector.Error as e:
18     print("查询数据失败！",str(e))
19 finally:
20     cursor.close()
21     db.close()

 1 import openpyxl
 2 #打开文件
 3 path_file = "D:/PycharmProjects/open.xlsx"
 4 wp = openpyxl.load_workbook(path_file)
 5 
 6 print("获取所有工作表名：",wp.get_sheet_names())
 7 # sheet = wp.get_sheet_by_name("Sheet1")   #获取指定的工作表sheet
 8 # print("获取指定的工作表名:",sheet.title)
 9 sheet2 = wp.get_active_sheet()             #获取活动的工作表sheet,一般是当前打开的sheet页
10 print("获取活动的工作表名:",sheet2.title)
11 
12 
13 # 操作单元格:数据的读取与写入
14 # 获取单元格数据
15 print(sheet2[‘A1‘].value)
16 print(sheet2.cell(row=2,column=1).value)    #获取第二行第一列的值
17 
18 # 数据的写入
19 sheet2.cell(row=4,column=1).value = http://www.mamicode.com/"工作总结"
20 sheet2[‘C3‘]=‘cs‘
21 
22 print("最大列数",sheet2.max_column)
23 print("最大行数",sheet2.max_row)
24 
25 # wp.save(‘D:/PycharmProjects/open1.xlsx‘)     #另存为
26 wp.save("open.xlsx")                           #保存,默认保存在当前目录下
27 wp.save(path_file)                             #覆盖保存