python设置文件权限

　　1、os.chmod()方法 此方法通过数值模式更新路径或文件权限。该模式可采取下列值或按位或运算组合之一：

　　stat.S_ISUID: Set user ID on execution.

　　stat.S_ISGID: Set group ID on execution.

　　stat.S_ENFMT: Record locking enforced.

　　stat.S_ISVTX: Save text image after execution.

　　stat.S_IREAD: Read by owner.

　　stat.S_IWRITE: Write by owner.

　　stat.S_IEXEC: Execute by owner.

　　stat.S_IRWXU: Read, write, and execute by owner.

　　stat.S_IRUSR: Read by owner.

　　stat.S_IWUSR: Write by owner.

　　stat.S_IXUSR: Execute by owner.

　　stat.S_IRWXG: Read, write, and execute by group.

　　stat.S_IRGRP: Read by group.

　　stat.S_IWGRP: Write by group.

　　stat.S_IXGRP: Execute by group.

　　stat.S_IRWXO: Read, write, and execute by others.

　　stat.S_IROTH: Read by others.

　　stat.S_IWOTH: Write by others.

　　stat.S_IXOTH: Execute by others.

　　2、语法：

　　os.chmod(path, mode);

　　3、参数：

　　path: This is the path for which mode would be set.

　　mode: This may take one of the above mentioned values or bitwise ORedcombinations of them: