Real type¶
-
class
pyasn1.type.univ.
Real
(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection())¶ Create Real type or object.
Real objects are immutable and duck-type Python
float
objects. Additionally, Real objects behave like atuple
in which case its elements are mantissa, base and exponent.Parameters: - value (
tuple
,float
or Real object) – Python sequence ofint
(representing mantissa, base and exponent) or float instance or Real class instance. - tagSet (
TagSet
) – Object representing non-default ASN.1 tag(s) - subtypeSpec (
ConstraintsIntersection
) – Object representing non-default ASN.1 subtype constraint(s)
Raises: : :py:class:`pyasn1.error.PyAsn1Error` – On constraint violation or bad initializer.
Note
The Real type models a rational number of arbitrary precision.
-
clone
(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection())¶ Create a copy of a Real type or object.
Any parameters to the clone() method will replace corresponding properties of the Real object.
Parameters: - value (
tuple
,float
or Real 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
Returns: new instance of Real type/value
- value (
-
subtype
(value=NoValue(), implicitTag=Tag(), explicitTag=Tag(), subtypeSpec=ConstraintsIntersection())¶ Create a copy of a Real type or object.
Any parameters to the subtype() method will be added to the corresponding properties of the Real object.
Parameters: - value (
tuple
,float
or Real 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’sTagSet
, then use the result as new object’s ASN.1 tag(s). - explicitTag (
Tag
) – Explicitly apply given ASN.1 tag object to caller’sTagSet
, then use the result as new object’s ASN.1 tag(s). - subtypeSpec (
ConstraintsIntersection
) – Object representing ASN.1 subtype constraint(s) to use in new object instead of inheriting from the caller
Returns: new instance of Real type/value
- value (
-
tagSet
= TagSet((), Tag(tagClass=0, tagFormat=0, tagId=9))¶ Default
TagSet
object for ASN.1 Real objects
-
subtypeSpec
= ConstraintsIntersection()¶ Default
ConstraintsIntersection
object imposing constraints on initialization values.
-
hasValue
()¶ Indicate if Real 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: bool
–True
if object is ASN.1 value,False
otherwise.
-
isSameTypeWith
(other, matchTags=True, matchConstraints=True)¶ Examine Real 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: bool
–True
if other is Real type,False
otherwise.
-
isSuperTypeOf
(other, matchTags=True, matchConstraints=True)¶ Examine Real 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: bool
–True
if other is a subtype of Real type,False
otherwise.
- value (