Python Operations files and directories: OS

Import module:

Import OS

Display operating system type:

os.name 

Posix

Show System Details:

os.uname () 

Posix.uname_result (sysname= ' Linux ', nodename= ' 18205c3de5e0 ', release= ' 3.13.0-32-generic ', version= ' #57-ubuntu SMP Tue Jul 03:51:08 UTC ', machine= ' x86_64 ')

To display environment variables:

os.environ 

Environ ({' versioner_python_prefer_32_bit ': ' No ', ' term_program_version ': ' 326 ', ' LOGNAME ': ' Michael ', ' USER ': ' Michael ', ' PATH ': '/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/x11/bin:/usr/local/mysql/bin ', ...})

Gets the value of an environment variable:

os.environ.get (' PATH ') 

'/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/x11/bin:/usr/local/mysql/bin '

To view the absolute path of the current directory:

os.path.abspath ('. ') 

/

To integrate the directory path, just take the path and look at it without actually creating it:

os.path.join ('/home/q/documents/temp/io ',  ' NW ') 

[Email protected]:~/documents/temp/io$ python join.py/home/s/documents/temp/io/nw[email protected]:~/documents/ temp/io$ lsa.txt dir.py file.py join.py stringio.py

To actually create a directory:

os.mkdir ('/home/q/documents/temp/io/nw ') 

[Email protected]:~/documents/temp/io$ python join.py none[email protected]:~/documents/temp/io$ lsa.txt dir.py file.py join.py NW stringio.py

To delete a directory:

os.rmdir ('/home/q/documents/temp/io/nw ') 

[Email protected]:~/documents/temp/io$ python join.py none[email protected]:~/documents/temp/io$ lsa.txt dir.py file.py join.py stringio.py

1. Use the OS module to write a program that implements the DIR-L output.

#!/usr/bin/python# -*- coding: utf-8 -*-from datetime import datetimeimport  ospwd = os.path.abspath ('. ') Print ('       Size     Last Modified   Name ') print ('------------------------------------------------------------') For f in os.listdir ( PWD):     fsize = os.path.getsize (f)     mtime =  Datetime.fromtimestamp (Os.path.getmtime (f)). Strftime ('%y-%m-%d %h:%m ')     flag =   '/'  if os.path.isdir (f)  else  '     print ('%10d  %s   %s%s '  %  (Fsize, mtime, f, flag))

run Result:

Size last Modified Name------------------------------------------------------------469 2018-07-23 18:25 dir. PY 769 2018-07-23 17:48 file.py 186 2018-07-23 18:14 stringio.py one 2018-07-23 17:31 a.txt 12 288 2018-07-23 18:25. dir.py.swp

Python Operations files and directories: OS