#!/usr/bin/env python3
#_*_ coding: utf-8 _*_
__author__ = 'GonnaZero'

import sys
un = sys.getdefaultencoding()
print(un)

def strCase():
    #字符串大小转换
    print("演示字符串大小转换")
    print("演示字符串S赋值为：'This is a PYTHON'")
    S = 'This is a PYTHON'
    print("大写转换成小写：\tS.lower() \t= %s" %(S.lower()))
    print("小写转换成大写：\tS.upper() \t= %s" %(S.upper()))
    print("大小写转换：\t\tS.swapcase() \t= %s" %(S.swapcase()))
    print("首字母大写：\t\tS.title() \t= %s" %(S.title()))
    print("\n")

def strFind():
    #字符串搜索替换
    print("演示字符串搜索替换等")
    print("演示字符串S赋值为：'This is a PYTHON'")
    S = "This is a PYTHON"
    print("字符串搜索：\t\tS.find('is') \t= %s" %(S.find('is')))
    print("字符串统计：\t\tS.count('s') \t= %s" %(S.count('s')))
    print("字符串替换：\t\tS.replace('Is','is') = %s" %(S.replace('Is','is')))
    print("去左右边空格：\t\tS.strip() \t=#%s#" %(S.strip()))
    print("去左边空格：\t\tS.lstrip() \t=#%s#" %(S.lstrip()))
    print("去右边空格：\t\tS.rstrip() \t=#%s#" %(S.rstrip()))
    print("\n")

def strSplit():
    #字符串分割，组合
    print("演示字符串分割组合")
    print("演示字符串S赋值为：'This is a PYTHON '")
    S = 'This is a PYTHON'
    print("字符串分割：\t\tS.split() \t= %s" %(S.split()))
    print("字符串组合1：'#'.join(['this','is','a','python']) \t=%s" %('#'.join(['this','is','a','python'])))
    print("字符串组合2：'$'.join(['this','is','a','python']) \t=%s" %('$'.join(['this','is','a','python'])))
    print("字符串组合3：' '.join(['this','is','a','python']) \t=%s" %(' '.join(['this','is','a','python'])))
    print("\n")

def strCode():
    #字符串编码解码
    #S.decode(encoding):将以encoding编码的S解码成unicode编码
    #S.encode(encoding):将以 unicode编码的S编码成encoding, encoding可以是gb2312，gbk，big5等
    #字符串通过编码转换为字节码，字节码通过解码转换为字符串str--->(encode)--->bytes，bytes--->(decode)--->str
    print("演示字符串编码解码")
    print("演示字符串S赋值为：'编码解码测试'")
    S = '编码解码测试'
    #以下代码及供参考，python3默认是utf-8编码 不是GBK编码
    print("GBK编码的S \t = %s" %(S))
    print("GBK编码的S转换 unicode编码")
    print("S.encode('utf-8')= %s" %(S.encode("utf-8")))
    print("GBK编码的S转换成utf8")
    print("S.encode('utf-8').decode('utf-8') =%s" %(S.encode('utf-8').decode("utf8")))
    print("注意：不管是编码还是解码针对的都是unicode字符编码，\n所以要编码或者解码前必须先将原字符串转换成unicode编码格式")
    print("\n")


def strTest():
    #字符串测试
    print("演示字符串测试")
    print("演示字符串S赋值为：'abcd'")
    S = 'abcd'
    print("测试是否全是字母S.isalpha() = %s" %(S.isalpha()))
    print("测试是否全是数字S.isdigit() = %s" %(S.isdigit()))
    print("测试是否全是空白字符S.isspace() = %s" %(S.isspace()))
    print("测试是否全是小写S.islower() = %s" %(S.islower()))
    print("测试是否全是大写S.isupper() = %s" %(S.isupper()))
    print("测试是否首字母大写S.istitle() = %s" %(S.istitle()))

if __name__ == '__main__':
    strCase()
    strFind()
    strSplit()
    strCode()
    strTest()