Constraint functions/objects for pysnmp
 
Constraints are relatively rare, but every ASN1 object
is doing checks all the time for whether they have any
constraints and whether they are applicable to the object.
 
What we're going to do is define objects/functions that
can be called unconditionally if they are present, and that
are simply not present if there are no constraints.

Modules
		pysnmp.asn1.error

Classes
		object Constraint SingleValueConstraint SingleValueConstraint   class Constraint(object)     Abstract base-class for constraint objects   Constraints should be stored in a simple sequence in the namespace of their client Asn1Object sub-classes.     Methods defined here: __call__(self, client, value) Raise errors if value not appropriate for client Data and other attributes defined here: __dict__ = <dictproxy object> dictionary for instance variables (if defined) __weakref__ = <attribute '__weakref__' of 'Constraint' objects> list of weak references to the object (if defined)   PermittedAlphabetConstraint = class SingleValueConstraint(Constraint)     Value must be part of defined set constraint     Method resolution order: SingleValueConstraint Constraint object Methods defined here: __call__(self, client, value) Raise errors if value not appropriate for client __init__(self, *set) Initialise the SingleValueConstraint with items   *set -- hashable objects allowed Data and other attributes inherited from Constraint: __dict__ = <dictproxy object> dictionary for instance variables (if defined) __weakref__ = <attribute '__weakref__' of 'Constraint' objects> list of weak references to the object (if defined)   class SingleValueConstraint(Constraint)     Value must be part of defined set constraint     Method resolution order: SingleValueConstraint Constraint object Methods defined here: __call__(self, client, value) Raise errors if value not appropriate for client __init__(self, *set) Initialise the SingleValueConstraint with items   *set -- hashable objects allowed Data and other attributes inherited from Constraint: __dict__ = <dictproxy object> dictionary for instance variables (if defined) __weakref__ = <attribute '__weakref__' of 'Constraint' objects> list of weak references to the object (if defined)

Functions
		ValueRangeConstraint(start, stop) Construct a callable object for checking value-range within start:stop inclusive ValueSizeConstraint(start, stop) Construct a callable object for checking value-range within start:stop inclusive