测试派 Give testers a home.

#示例一：小写变大写
msg_1 = 'my name is sophia'
print('小写变大写后是：'+msg_1.upper())

#示例二：大写变小写
msg_2 = 'MY NAME IS SOPHIA'
print('大写变大写后是：'+msg_2.lower())

#示例三：大写变小写，小写变大写，生成镜像字符串;利用字符串的内置方法来解决
def change_msg_3(s):
s = s.swapcase()#互换大小写
in_tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
out_tab = 'ZYXWVUTSRQPONMLKJIHGFEDCBAzyxwvutsrqponmlkjihgfedcba'
reflect = s.maketrans(in_tab, out_tab)#建立翻译表
s = s.translate(reflect)#根据翻译表进行翻译
return s
if name == 'main':
s = 'MynameisSOPHIA'
new_s = change_msg_3(s)
print("转换之前的字符串：", s)
print("转换之后的字符串：", new_s)