The basic operation modules python os

# Os module directory built-in library-related 
Import os 
# current directory .. go back one level. 
# 1. os.path.abspath () - Gets the absolute path of the current file (not including the os module .py) pwd 
# path = os.path.abspath ( ".") 
# Print (path) #D: \ Starter Test \ Python basis \ exercise 

# 2. os.path.realpath (__ file__) - get the full path of the current file 
# print (os. path.realpath (__ file__)) #D: \ Test \ Python Basics \ practice \ os module .py 

# 3. os.path.dirname () - gets the current absolute file path pwd 
# Print (os.path.dirname (os.path.realpath (__ file__))) #D: \ Test \ Basics Python \ exercise 

# 4. os.path.dirname (os.path.dirname (os.path.realpath ( __ file__))) - Gets on a path to an absolute path 
# print (os.path.dirname (os.path.dirname (os.path.realpath (__ file__)))) #D: \ Test \ Python Basics 

# 5. os.path.join (a, b) splicing the two directory paths 
# print (os.path.join (os.path.dirname (os.path.realpath (__ file __)), "os module .py"))
Os.path.dirname pwdpath = # (the os.path.realpath (__ file__)) 
# = pjpath the os.path.join (pwdpath, "OS module .py") 
# Print ( "full path splicing:", pjpath) 
# print ( "full path to the stitched:", the os.path.realpath (__ file__)) 
# full path to the mosaic: D: \ Test \ Basics Python \ practice \ os module .py 
the full path to the # splicing: D: \ Test \ Basics Python \ practice \ os module .py 

# 6. os.path.splitext () to separate out the file extension and file 
# filepath = the os.path.realpath (__ file__) 
# Print ( "get full path to the file: ", filepath) 
# = fileParh os.path.splitext (filepath) 
# print (" Get the delimited file: ", fileParh) # returns a tuple format 
# print (" Get rear partition file suffix: ", fileParh [-1]) 
the full path to # obtain files: D: \ Test \ Basics Python \ practice \ os module .py 
# obtain files after separation: ( 'D: \\ Test \\ Python exercise Basics \\ \\ os module ',' .py ') 
# get separated after the file name suffix: .py 

# 7. os.path.normpath () - irregular path becomes a path specification
Str1 = # "E: \ Program Files (the x86) \ 360 \ 360Safe \ Config \ /// advtools \ WenJianFenSuiJi.xml" 
# Print ( "canonical path:", os.path.normpath (str1)) 

#. 8. other methods 
"" " 
os.chdir (path =" path ") switching paths 
os.getcwd () to get the current directory - the absolute path 
os.mkdir () to create a directory 
os.listdir () lists all the files in the current directory and directory 
"" " 

# 9. Analyzing files and directories 
" "" 
os.path.isdir ( "directory path") -> return exists True, the anti False 
the os.path.isfile ( "file path") - > there is return True, the anti-False 
"" " 

# os module combat 
# print out the C: \ All .dll files in the Program files \ Internet Explorer directory 
os.chdir (" C: \ Program files \ Internet Explorer ") 
# Print ( "current directory:", os.getcwd ()) 
# Print ( "all files and directories under the current directory:", os.listdir())
List = os.listdir()
for index in List:
    if ".dll" in index:
        print ( "ending in .dll files:", index)