Bastion— Restricting access to objects
Deprecated since version 2.6: The
Bastion module has been removed in Python 3.
Changed in version 2.3: Disabled module.
The documentation has been left in place to help in reading old code that uses the module.
According to the dictionary, a bastion is “a fortified area or position”, or
“something that is considered a stronghold.” It’s a suitable name for this
module, which provides a way to forbid access to certain attributes of an
object. It must always be used with the
rexec module, in order to allow
restricted-mode programs access to certain safe attributes of an object, while
denying access to other, unsafe attributes.
Bastion(object[, filter[, name[, class]]])
Protect the object object, returning a bastion for the object. Any attempt to
access one of the object’s attributes will have to be approved by the filter
function; if the access is denied an
AttributeError exception will be
If present, filter must be a function that accepts a string containing an
attribute name, and returns true if access to that attribute will be permitted;
if filter returns false, the access is denied. The default filter denies
access to any function beginning with an underscore (
'_'). The bastion’s
string representation will be
<Bastion for name> if a value for name is
repr(object) will be used.
Bastion(). The getfunc parameter is a function which returns the value of an attribute which should be exposed to the restricted execution environment when called with the name of the attribute as the only parameter. name is used to construct the