univ.py 文件源码

def subtype(self, value=noValue, **kwargs):
        """Create a copy of a |ASN.1| type or object.

        Any parameters to the *subtype()* method will be added to the corresponding
        properties of the |ASN.1| object.

        Parameters
        ----------
        value: :class:`int`, :class:`str` or |ASN.1| object
            Initialization value to pass to new ASN.1 object instead of 
            inheriting one from the caller.

        implicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Implicitly apply given ASN.1 tag object to caller's 
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        explicitTag: :py:class:`~pyasn1.type.tag.Tag`
            Explicitly apply given ASN.1 tag object to caller's 
            :py:class:`~pyasn1.type.tag.TagSet`, then use the result as
            new object's ASN.1 tag(s).

        subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection`
            Add ASN.1 constraints object to one of the caller, then
            use the result as new object's ASN.1 constraints.

        namedValues: :py:class:`~pyasn1.type.namedval.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 |ASN.1| type/value
        """
        return base.AbstractSimpleAsn1Item.subtype(self, value, **kwargs)

    # backward compatibility