Any type

class pyasn1.type.univ.Any(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='iso-8859-1', binValue=NoValue(), hexValue=NoValue())

Create Any schema or value object.

Any objects are immutable and duck-type Python 2 str or Python 3 bytes. When used in Unicode context, Any type assumes “iso-8859-1” serialisation.

Keyword Arguments:
 
  • value (str, bytes or Any object) – string (Python 2) or bytes (Python 3), alternatively unicode object (Python 2) or string (Python 3) representing character string to be serialised into octets (note encoding parameter) or Any object.
  • tagSet (TagSet) – Object representing non-default ASN.1 tag(s)
  • subtypeSpec (ConstraintsIntersection) – Object representing non-default ASN.1 subtype constraint(s)
  • encoding (str) – Unicode codec ID to encode/decode unicode (Python 2) or str (Python 3) the payload when Any object is used in text string context.
  • binValue (str) – Binary string initializer to use instead of the value. Example: ‘10110011’.
  • hexValue (str) – Hexadecimal string initializer to use instead of the value. Example: ‘DEADBEEF’.
Raises:

PyAsn1Error – On constraint violation or bad initializer.

Examples

class Error(Sequence):
    '''
    ASN.1 specification:

    Error ::= SEQUENCE {
        code      INTEGER,
        parameter ANY DEFINED BY code  -- Either INTEGER or REAL
    }
    '''
    componentType=NamedTypes(
        NamedType('code', Integer()),
        NamedType('parameter', Any(),
                  openType=OpenType('code', {1: Integer(),
                                             2: Real()}))
    )

error = Error()
error['code'] = 1
error['parameter'] = Integer(1234)

Note

The Any type models an arbitrary value of an arbitrary type. Typically, a selection of types are defined in form of an open type . Technically, the ANY value is a serialised representation of some other ASN.1 object.

clone(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='iso-8859-1')

Create a modified version of Any schema or value object.

The clone() method accepts the same set arguments as Any class takes on instantiation except that all arguments of the clone() method are optional.

Whatever arguments are supplied, they are used to create a copy of self taking precedence over the ones used to instantiate self.

Note

Due to the immutable nature of the Any object, if no arguments are supplied, no new Any object will be created and self will be returned instead.

subtype(value=NoValue(), implicitTag=Tag(), explicitTag=Tag(), subtypeSpec=ConstraintsIntersection(), encoding='iso-8859-1')

Create a specialization of Any schema or value object.

The subtype relationship between ASN.1 types has no correlation with subtype relationship between Python types. ASN.1 type is mainly identified by its tag(s) (TagSet) and value range constraints (ConstraintsIntersection). These ASN.1 type properties are implemented as Any attributes.

The subtype() method accepts the same set arguments as Any class takes on instantiation except that all parameters of the subtype() method are optional.

With the exception of the arguments described below, the rest of supplied arguments they are used to create a copy of self taking precedence over the ones used to instantiate self.

The following arguments to subtype() create a ASN.1 subtype out of Any type:

Other Parameters:
 
  • implicitTag (Tag) – Implicitly apply given ASN.1 tag object to self’s TagSet, then use the result as new object’s ASN.1 tag(s).
  • explicitTag (Tag) – Explicitly apply given ASN.1 tag object to self’s TagSet, then use the result as new object’s ASN.1 tag(s).
  • subtypeSpec (ConstraintsIntersection) – Add ASN.1 constraints object to one of the self’s, then use the result as new object’s ASN.1 constraints.
Returns:

new instance of Any schema or value object

Note

Due to the immutable nature of the Any object, if no arguments are supplied, no new Any object will be created and self will be returned instead.

effectiveTagSet

For Any type is equivalent to tagSet

isSameTypeWith(other, matchTags=True, matchConstraints=True)

Examine Any type for equality with other ASN.1 type.

ASN.1 tags (tag) and constraints (constraint) are examined when carrying out ASN.1 types comparison.

Python class inheritance relationship is NOT considered.

Parameters:other (a pyasn1 type object) – Class instance representing ASN.1 type.
Returns:boolTrue if other is Any type, False otherwise.
isSuperTypeOf(other, matchTags=True, matchConstraints=True)

Examine Any type for subtype relationship with other ASN.1 type.

ASN.1 tags (tag) and constraints (constraint) are examined when carrying out ASN.1 types comparison.

Python class inheritance relationship is NOT considered.

Parameters:other (a pyasn1 type object) – Class instance representing ASN.1 type.
Returns:boolTrue if other is a subtype of Any type, False otherwise.
isValue

Indicate that Any object represents ASN.1 value.

If isValue is False then this object represents just ASN.1 schema.

If isValue is True then, in addition to its ASN.1 schema features, this object can also be used like a Python built-in object (e.g. int, str, dict etc.).

Returns:boolFalse if object represents just ASN.1 schema. True if object represents ASN.1 schema and can be used as a normal value.

Note

There is an important distinction between PyASN1 schema and value objects. The PyASN1 schema objects can only participate in ASN.1 schema-related operations (e.g. defining or testing the structure of the data). Most obvious uses of ASN.1 schema is to guide serialisation codecs whilst encoding/decoding serialised ASN.1 contents.

The PyASN1 value objects can additionally participate in many operations involving regular Python objects (e.g. arithmetic, comprehension etc).

tagSet = <TagSet object at 0x110ad5710 untagged>

Set (on class, not on instance) or return a TagSet object representing ASN.1 tag(s) associated with Any type.

subtypeSpec = <ConstraintsIntersection object>

Set (on class, not on instance) or return a ConstraintsIntersection object imposing constraints on Any type initialization values.

tagMap

“Return a TagMap object mapping ASN.1 tags to ASN.1 objects contained within callee.