‘’.join('') #连接字符串#可以将一个list 变成字符串#通过某个字符串把 list 里面的每个元素连接起来#只要是可以循环的，就可以通过 join 方法连接
例： l = ['zhang','liu','liang'] res = ''.join(l) #以空字符串连接 l 里面的字符串 print（res) ------- zhangliuliang
name = ['xiaohong','lynn'] res_name = '--'.join(name) #以‘--’连接 name 里面的字符串 print(res_name) ------- xiaohong--lynn
import string #导入string 模块print（string.ascii_lowercase) #所有的小写字母print（string.ascii_uppercase) #所有的大写字母print（string.digits) #所有的数字print (string.ascii_letters) #所有的大、小写字母print（string.punctuation) #所有的特殊字符
.split('') #分割字符串#根据某个字符串，进行分割字符串，同时返回 list#什么都不传的情况，默认以‘空格’分割
例：a = 'niuhanyang,zch,caoran,yangyafu'name = a.split(',') #以‘，’进行分割字符串print(name) -------- ['niuhanyang', 'zch', 'caoran', 'yangyafu']
.format #format 格式化使用
例：user = 'lynn'sex = '女'age = '25'addr = '上海'money = '100w'cars = '1台'word = 'insert into user VALUES ("%s","%s","%s","%s","%s","%s");' %(user,sex,age,addr,money,cars)sql = 'insert into user VALUES ("{name}","{sex}","{age}","{addr}","{qian}","{che}");'new_sql = sql.format(name = user,sex = sex,qian = money,addr = addr,che = cars,age = age) #format 格式化变量print(word)print(new_sql)
a.center(10,'*') #a的长度不足10时，以‘*’补全，以a的圆熟为中心，右左顺序补全
例：print('haungying'.center(20,'*')) -------- *****haungying******print('*'.center(5,'-')) ------------------ 22*22
转载于:https://www.cnblogs.com/lynn-chen/p/8691045.html
