Python judges a user's permissions on a file

This article describes in detail how Python judges a user's permissions on a file, which has some reference value, if you are interested, you can refer to Python to determine whether a file has read, write, and execution permissions for the current user. we usually use the OS. for example:

# Judge the read permission OS. access (
 
  
, OS. R_ OK) # judge the write permission OS. access (
  
   
, OS. W_ OK) # judge the execution permission OS. access (
   
    
, OS. X_ OK) # judge read, write, and execute permissions for OS. access (
    
     
, OS. R_ OK | OS. W_ OK | OS. X_ OK)
    
   
  
 

However, if you want to determine whether a specified user has the read, write, and execution permissions on a file, Python does not implement this by default. in this case, you can use the following code to determine whether a specified user has the read, write, and execution permissions on the file.

import osimport pwdimport stat def is_readable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IRUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IRGRP > 0)) or    (mode & stat.S_IROTH > 0)    )def is_writable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IWUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IWGRP > 0)) or    (mode & stat.S_IWOTH > 0)    )def is_executable(cls, path, user):  user_info = pwd.getpwnam(user)  uid = user_info.pw_uid  gid = user_info.pw_gid  s = os.stat(path)  mode = s[stat.ST_MODE]  return (    ((s[stat.ST_UID] == uid) and (mode & stat.S_IXUSR > 0)) or    ((s[stat.ST_GID] == gid) and (mode & stat.S_IXGRP > 0)) or    (mode & stat.S_IXOTH > 0)    )

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