Python third-party library series 23--Path Library

First, remove the current path:

Base_dir1 = Os.path.dirname (Os.path.dirname (__file__))
Base_dir2 = Os.path.dirname (Os.path.abspath (__file__))
# __file__: Refers to the directory address where this file resides (including the file name) but is related to the directory where the Python command is executed (relative address).
# dirname (__file__): The top level of the file.
# Abspath (__file__): The absolute path where the file is located (including the file name in this address).

Second, determine whether the path exists

(1) Determine if the folder exists

Os.path.exists (PATH)

(2) Determine whether the file exists

Os.path.isfile (' a.txt ') #如果不存在就返回False 
os.path.exists (directory) #如果目录不存在就返回False

(3) Create a folder

Os.makedirs (path) #多层创建目录
os.mkdir (path) #创建目录