python pathlib 构建路径

import pathlib
 
usr = pathlib.PurePosixPath('/usr')
print(usr) # /usr
 
usr_local = usr / 'local'
print(usr_local) # /usr/local
 
usr_share = usr / pathlib.PurePosixPath('share')
print(usr_share) # /usr/share
 
root = usr / '..'
print(root) # /usr/..
 
etc = root / '/etc/'
print(etc) # /etc