os.path.exists is not working as expected in python -


i trying create directory in home path , re-check if directory exists in home path before re-creating using os.path.exists(), not working expected.

if os.access("./", os.w_ok) not true:     print("folder not writable")     dir_name_tmp = subprocess.popen('pwd', stdout=subprocess.pipe, shell=true)     dir_name_tmp = dir_name_tmp.stdout.read()     dir_name = dir_name_tmp.split('/')[-1]     dir_name = dir_name.rstrip()      os.system('ls ~/')     print "%s"%dir_name      if not os.path.exists("~/%s"%(dir_name)):         print "going create new folder %s in home path\n"%(dir_name)         os.system('mkdir ~/%s'%(dir_name))     else:         print "folder %s exists\n"%(dir_name)         os.system('rm -rf ~/%s & mkdir ~/%s'%(dir_name, dir_name)) else :     print("folder writable")

output first time:

folder not writable desktop  downloads  perforce  bkp  doc  project hello.list going create new folder hello.list in home path

output 2nd time:

folder not writable desktop  downloads  perforce  bkp  doc  hello.list  project hello.list going create new folder hello.list in home path  mkdir: cannot create directory `/home/desperado/hello.list': file exists

its not going else loop though directory existing. missing ? share in inputs !

updated working code suggestions provided: using $home directory , os.path.expandusr

if os.access("./", os.w_ok) not true:     log.debug("folder not writable")     dir_name_tmp = subprocess.popen('pwd', stdout=subprocess.pipe, shell=true)     dir_name_tmp = dir_name_tmp.stdout.read()     dir_name = dir_name_tmp.split('/')[-1]     dir_name = dir_name.rstrip()      log.debug("dir_name %s"%dir_name)      dir_name_path = (os.path.expanduser('~/%s'%(dir_name))).rstrip()     log.debug("dir_name_path %s"%(dir_name_path))      # if not os.path.exists('~/%s'%(dir_name)):     if not os.path.exists('%s'%(dir_name_path)):         log.debug("going create new folder %s in home path\n"%(dir_name))         os.system('mkdir $home/%s'%(dir_name))     else:         log.debug("folder %s exists\n"%(dir_name))         os.system('rm -rf %s'%(dir_name_path))         os.system('mkdir $home/%s'%(dir_name)) else :     log.debug("folder writable")

the tilde symbol ~ representing home directory shell convention. expanded shell in os.system, understood literally in python.

so create <home>/<dir>, test ~/<dir>.


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