Wu Yuxiong - born naturally PYTHON3 development of learning: OS file / directory method

Import OS, SYS 

# assumed /tmp/foo.txt file exists, and read and write permissions 

RET = os.access ( " /tmp/foo.txt " , os.F_OK)
 Print ( " F_OK - returns the value S% " % RET) 

RET = os.access ( " /tmp/foo.txt " , os.R_OK)
 Print ( " R_OK - returns the value S% " % RET) 

RET = os.access ( " /tmp/foo.txt " , OS .W_OK)
 Print ( " W_OK - returns the value S% " % RET) 

RET = os.access (" /Tmp/foo.txt " , os.X_OK)
 Print ( " X_OK - returns the value S% " % RET)

Import os, SYS 

path = " / tmp " 

# to view the current working directory 
retval = os.getcwd ()
 Print ( " current working directory is S% " % retval) 

# change the current directory 
os.chdir (path) 

# After a review of modified working directory 
retval = os.getcwd () 

Print ( " directory successfully modified S% " % retval)

Import OS, STAT 

path = " /tmp/foo.txt " 

# file flag is set, so that it can not be deleted, and renamed 
the flags = stat.SF_NOUNLINK 
retval = os.chflags (path, the flags)
 Print ( " Return Value:% S " % retval)

Import OS, SYS, STAT 

# assuming /tmp/foo.txt file exists, the setting file can be performed by the user group 

os.chmod ( " /tmp/foo.txt " , stat.S_IXGRP) 

# setting file can be written to other users 
os.chmod ( " /tmp/foo.txt " , stat.S_IWOTH) 

Print ( " modified successfully! " )

Import os, SYS 

# assumed /tmp/foo.txt file exists. 
# Set the owner ID to 100 
os.chown ( " /tmp/foo.txt " , 100, -1 ) 

Print ( " Modify permission success !! " )

Import os, SYS 

# Set the root directory to / tmp 

os.chroot ( " / tmp " ) 

Print ( " Modify the root of success !! " )

Import os, SYS 

# open the file 
fd = os.open ( " foo.txt " , os.O_RDWR | os.O_CREAT) 

#   write string 
os.write (fd, " This IS the Test " ) 

# close the file 
os.close (fd) 

Print ( " close the file success! " )

Import os, SYS 

# open the file 
fd = os.open ( " foo.txt " , os.O_RDWR | os.O_CREAT) 

# write string 
os.write (fd, " This IS the Test " ) 

# close the file 
os.closerange (fd, fd) 

Print ( " close the file success! " )

Import OS, SYS 

# switch to the "/ var / www / html" directory of 
the os.chdir ( " / var / WWW / HTML " ) 

# Print directory 
Print ( " current working directory:% S " % The os.getcwd ()) 

# open the "/ tmp" 
FD = os.open ( " / tmp " , os.O_RDONLY) 

# use os.fchdir () method to modify the directory 
os.fchdir (FD) 

# Print directory 
Print ( " current working directory:% s " % os.getcwd ()) 

# close the file 
os.close (fd)

Import OS, SYS
 # open the file 
FD = os.open ( " f1.txt " , os.O_RDWR) 
   
# reads text 
RET = os.read (FD, 12 is )
 Print (RET) 

# close the file 
os.close (fd)
 Print ( " close the file success! " )

Import OS 

the src = ' / usr / bin / Python ' 
DST = ' / tmp / Python ' 

# create the soft link 
os.symlink (the src, DST) 

# soft link display source link 
path = os.readlink (DST)
 Print (path )

Import os, SYS 

# listed in the directory 
print ( " directory:% S " % os.listdir (os.getcwd ())) 

# remove 
os.remove ( " aa.txt " ) 

# directory listing after removing the 
print ( " after removal:% S " % the os.listdir (the os.getcwd ()))

Import os, SYS 

# listed in the directory 
Print ( " directory:% S " % os.listdir (os.getcwd ())) 

# rename 
os.rename ( " the Test " , " test2 " ) 

Print ( " Rename successful . " ) 

# list directory renamed 
Print ( " directory:% S " % os.listdir (os.getcwd ()))

os Mport, SYS 

# open the file 
fd = os.open ( " f1.txt " , os.O_RDWR | os.O_CREAT) 

# write the string 
str = " This IS runoob.com Site " 
RET = os.write (fd, bytes (STR, ' UTF-. 8 ' )) 

# input return value 
Print ( " number of bits written is: " )
 Print (RET) 

Print ( " successfully written " ) 

# close the file 
os.close (FD)
 Print ( " Close the file success! " )

Import os 
 
Print (os.path.basename ( ' /root/runoob.txt ' ))    # Returns the filename 
Print (os.path.dirname ( ' /root/runoob.txt ' ))     # Returns the directory path 
Print (os. path.split ( ' /root/runoob.txt ' ))       # split the file name and path 
Print (the os.path.join ( ' the root ' , ' Test ' , ' runoob.txt ' ))   # directory and filename synthesis a path

Import os
 Import Time 
 
File = ' /root/runoob.txt '  # file path 
 
print (os.path.getatime (File))    # output last access time 
print (os.path.getctime (File))    # output file creation time 
print (os.path.getmtime (File))    # output last modification time 
Print (time.gmtime (os.path.getmtime (File)))   # output struct_time recently modified form 
Print (os.path.getsize (File))    # output file size (in bytes) 
Print (os.path.abspath (file))    # print absolute 
Print (os.path.normpath (file))  # Specification path string