Boolean type

class pyasn1.type.univ.Boolean(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection())

Create Boolean type or object.

Boolean objects are immutable and duck-type Python int objects.

Parameters:
  • value (int, str or Boolean object) – Python integer or string literal or Boolean class instance.
  • tagSet (TagSet) – Object representing non-default ASN.1 tag(s)
  • subtypeSpec (ConstraintsIntersection) – Object representing non-default ASN.1 subtype constraint(s)
  • namedValues (NamedValues) – Object representing non-default symbolic aliases for numbers
Raises:

pyasn1.error.PyAsn1Error – On constraint violation or bad initializer.

Note

The Boolean type models a BOOLEAN that can be either TRUE or FALSE.

clone(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection())

Create a copy of a Boolean type or object.

Any parameters to the clone() method will replace corresponding properties of the Boolean object.

Parameters:
  • value (int, str or Boolean object) – Initialization value to pass to new ASN.1 object instead of inheriting one from the caller.
  • tagSet (TagSet) – Object representing ASN.1 tag(s) to use in new object instead of inheriting from the caller
  • subtypeSpec (ConstraintsIntersection) – Object representing ASN.1 subtype constraint(s) to use in new object instead of inheriting from the caller
  • namedValues (NamedValues) – Object representing symbolic aliases for numbers to use instead of inheriting from caller
Returns:

new instance of Boolean type/value

subtype(value=NoValue(), implicitTag=Tag(), explicitTag=Tag(), subtypeSpec=ConstraintsIntersection())

Create a copy of a Boolean type or object.

Any parameters to the subtype() method will be added to the corresponding properties of the Boolean object.

Parameters:
  • value (int, str or Boolean object) – Initialization value to pass to new ASN.1 object instead of inheriting one from the caller.
  • implicitTag (Tag) – Implicitly apply given ASN.1 tag object to caller’s TagSet, then use the result as new object’s ASN.1 tag(s).
  • explicitTag (Tag) – Explicitly apply given ASN.1 tag object to caller’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 caller, then use the result as new object’s ASN.1 constraints.
  • namedValues (NamedValues) – Add given object representing symbolic aliases for numbers to one of the caller, then use the result as new object’s named numbers.
Returns:

new instance of Boolean type/value

tagSet = TagSet((), Tag(tagClass=0, tagFormat=0, tagId=1))

Default TagSet object for Boolean objects

subtypeSpec = ConstraintsIntersection(SingleValueConstraint(0, 1))

Default ConstraintsIntersection object imposing constraints on initialization values.

hasValue()

Indicate if Boolean object represents ASN.1 value or ASN.1 type.

The PyASN1 type objects can only participate in types comparison and serve as a blueprint for serialization codecs to resolve ambiguous types.

The PyASN1 value objects can additionally participate to most of built-in Python operations.

Returns:boolTrue if object is ASN.1 value, False otherwise.
isSameTypeWith(other, matchTags=True, matchConstraints=True)

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

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

No Python inheritance relationship between PyASN1 objects is considered.

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

Examine Boolean 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.

No Python inheritance relationship between PyASN1 objects is considered.

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