TeletexString type¶
- class pyasn1.type.char.TeletexString(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')¶
Creates TeletexString schema or value object.
TeletexString class is based on
SimpleAsn1Type
, its objects are immutable and duck-type Python 2str
or Python 3bytes
. When used in octet-stream context, TeletexString type assumes “iso-8859-1” encoding.- Keyword Arguments
value (
unicode
,str
,bytes
or TeletexString object) –unicode
object (Python 2) orstr
(Python 3), alternativelystr
(Python 2) orbytes
(Python 3) representing octet-stream of serialised unicode string (note encoding parameter) or TeletexString class instance. If value is not given, schema object will be created.tagSet (
TagSet
) – Object representing non-default ASN.1 tag(s)subtypeSpec (
ConstraintsIntersection
) – Object representing non-default ASN.1 subtype constraint(s). Constraints verification for TeletexString type occurs automatically on object instantiation.encoding (
str
) – Unicode codec ID to encode/decodeunicode
(Python 2) orstr
(Python 3) the payload when TeletexString object is used in octet-stream context.
- Raises
ValueConstraintError, PyAsn1Error – On constraint violation or bad initializer.
Note
The TeletexString type models character string that can be entered from a sophisticated text processing machines (by 20-th century standards) featuring letters from multiple alphabets (308 characters!), digits, punctuation marks and escape sequences.
- clone(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')¶
Create a modified version of TeletexString schema or value object.
The clone() method accepts the same set arguments as TeletexString 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 TeletexString object, if no arguments are supplied, no new TeletexString object will be created and self will be returned instead.
- subtype(value=NoValue(), implicitTag=Tag(), explicitTag=Tag(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')¶
Create a specialization of TeletexString 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 TeletexString attributes.The subtype() method accepts the same set arguments as TeletexString 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 TeletexString type:
- Other Parameters
implicitTag (
Tag
) – Implicitly apply given ASN.1 tag object to self’sTagSet
, then use the result as new object’s ASN.1 tag(s).explicitTag (
Tag
) – Explicitly apply given ASN.1 tag object to self’sTagSet
, 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 TeletexString schema or value object
Note
Due to the immutable nature of the TeletexString object, if no arguments are supplied, no new TeletexString object will be created and self will be returned instead.
- tagSet = <TagSet object, tags 0:0:20>¶
Set (on class, not on instance) or return a
TagSet
object representing ASN.1 tag(s) associated with TeletexString type.
- property isValue¶
Indicate that TeletexString 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
bool
–False
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).
- isSameTypeWith(other, matchTags=True, matchConstraints=True)¶
Examine TeletexString 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.
- isSuperTypeOf(other, matchTags=True, matchConstraints=True)¶
Examine TeletexString 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.
- property effectiveTagSet¶
For TeletexString type is equivalent to tagSet