Python中大小写转换函数

print('-----------------介绍一下大小写转换函数------------------------------')
dir=['xiaoming','XIAOGANG','XIAOqiang','From introduction to abandonment']
print('before      :',dir,'\n')
dir1=[dir.upper() for dir in dir]
dir2=[dir.lower() for dir in dir]
dir3=[dir.capitalize() for dir in dir]
dir4=[dir.title() for dir in dir]
print('upper()     :',dir1,'全部大写')
print('lower()     :',dir2,'全部小写')
print('capitalize():',dir3,'全部首字母大写')
print('title()     :',dir4,'每个单词的首字母大写(标题式)')