# !/usr/bin/env python3
# coding:utf-8
# @Version : 2019-02-18 16:58:51
# @Author  : Jiang Hui (jianghui@zigui.me)
# @Link    :
# @Description : python字符串大小写


def log(f):
    def fn(x):
        print(f.__name__, end="() ")
        return f(x)

    return fn


@log
class UserStr(str):
    """user defined class with method:
        1. iscapitalize()
        2. upside_down()
    """

    def __init__(self, str):
        self.str = str

    @log
    def iscapitalize(self):
        return self.str == self.str.capitalize()

    @log
    def upside_down(self):
        s = ''
        for i, j in enumerate(self.str.lower()):
            s += j if j != self.str[i:i + 1] else j.upper()
        return s


name = 'Author: jiang_hui@zigui.me'
name = UserStr(name)
print(name)

print(name.upper())
print(name.lower())
print(name.title())
print(name.capitalize())
print(name.upside_down())

print(name.isupper())
print(name.islower())
print(name.istitle())
print(name.iscapitalize())