#!/usr/bin/env python3
# -*- coding:utf-8 -*-
#expandtabs,断句20（\t类似于char字符特性）,可用于表格类制作.
test = "username\temail\tpassword\ncsdnak\tcsdnak@qq.com\t123\ntomcat\ttomcat@qq.com\t123\ngithub\tgithub@qq.com\t123"
v = test.expandtabs(20)
print(v)
#判断是否是字母、汉子(Python中判断真假:True/False与Shell中$0:0/非零性质类似)
test = "csdn阿坤"
v = test.isalpha()
print(v)
#判断是否为数字,isdecimal只支持十进制数字,isdigit更强大支持十进制数字以及②类型数字,isnumeric最强大可支持汉子二
test = "2②二"
v1 = test.isdecimal()
v2 = test.isdigit()
v3 = test.isnumeric()
print(v1,v2,v3)
#字母,数字,下划线:标识符 ,def class也符合
a = "def"
v = a.isidentifier()
print(v)
#是否包含不可显示的字符,例:制表符\t，换行符\n
test = "csdn\tak"
v = test.isprintable()
print(v)
#判断是否全部是空格或者有东西却看不见,例如\n,\t
test = "\n"
v = test.isspace()
print(v)
#判断是否为标题
test = "Return True if all cased characters in S are uppercase and there is"
v1 = test.istitle()#判断是否为标题(标题准则:每个单词首字母必须是大写)
print(v1)
v2 = test.title()#把字符转换为标题类型
print(v2)
v3 = v2.istitle()#经过转换后判断为True成立
print(v3)
#join,字符串元素拼接*****（重要等级为※）
test = "折戟沉沙铁未销"
t = ‘ ‘
v1 = t.join(test)
print(v1)
v2 = " ".join(test)
print(v2)
#just(个数,符号),填充(left/right)
test = "csdnak"
v1 = test.ljust(20,"*")
print(v1)
v2 = test.rjust(20,".")
print(v2)
#zfill(个数)填充,只能用0来填充并且填充永远是左边(一般不用)just足以。
v3 = test.zfill(20)
print(v3)
#判断小写并转换
test = "Alex"
v1 = test.lower()#全部转换成小写
v2 = v1.islower()#判断是否全部是小写
print(v2)
#判断大写并转换
v3 = test.upper()#全部转换成大写
v4 = v3.isupper()#判断是否全部是大写
print(v4)