python Path dependent functions
os.listdir(dirname)：List the directories and files under dirname
os.getcwd()：Get current working directory
os.curdir:Returns the current directory (“.”).
os.chdir(dirname):Change work directory to dirname
os.path.isdir(name):Determine whether name is a directory, and name is not a directory to return to false.
os.path.isfile(name):Judge whether name is a file, does not exist name, and returns to false?
os.path.exists(name):Determining whether there is a file or directory name
os.path.getsize(name):Get file size, if name is directory return 0
os.path.abspath(name):Get absolute path
os.path.normpath(path):Specification of path string format
os.path.split(name):Split the filename and directory (in fact, if you use the directory entirely, it also separates the last directory as the filename, and it does not determine whether the file or directory exists)
os.path.splitext():Separating filenames and extensions
os.path.join(path,name):Connect directory and file name or directory
os.path.basename(path):Return filename
os.path.dirname(path):Return file path