[python] Zmena atributu souboru

["VANĚK Petr"]

> potreboval bych vedet, jak zmenim atributy souboru.
> Vim, ze je k tomu funkce setattr(), ale vubec nevim jak ji pouzit.
> Ani z www.python.org jsem to nejak nepochopil. 
> Jak napr. odstranit u souboru 'a.txt' atribut Jen pro cteni (R) ?

6.1.4 Files and Directories
chmod( path, mode) 

Change the mode of path to the numeric mode. mode may take one of the following values (as defined in the stat module): 
S_ISUID 
S_ISGID 
S_ENFMT 
S_ISVTX 
S_IREAD 
S_IWRITE 
S_IEXEC 
S_IRWXU 
S_IRUSR 
S_IWUSR 
S_IXUSR 
S_IRWXG 
S_IRGRP 
S_IWGRP 
S_IXGRP 
S_IRWXO 
S_IROTH 
S_IWOTH 
S_IXOTH 
Availability: Unix, Windows. 

takze:
import os
import stat
os.chmod('a.txt', stat.S_IREAD) #atd. treba stat.S_IREAD | stat.S_IWRITE | ...

p.