PySNMP: ASN.1: Universal types: SequenceOf: Example

### Example of SequenceOf usage

    >>> from pysnmp.asn1 import univ
    >>> class MySequenceOf(univ.SequenceOf):
    ...     protoComponent = univ.OctetString
    ...
    >>> s = MySequenceOf([univ.OctetString('foo')])
    >>> s
    MySequenceOf(OctetString('foo'))
    >>> s.append(univ.OctetString('bar'))
    >>> s
    MySequenceOf(OctetString('foo'), OctetString('bar'))
    >>> len(s)
    2
    >>> 'foo' in s
    1
    >>> s.index('bar')
    1
    >>> del s[-1]
    >>> s
    MySequenceOf(OctetString('foo'))
    >>> s[0] = univ.Integer()
    Traceback (innermost last):
    ...
    pysnmp.asn1.error.BadArgumentError: Unexpected component type Integer at Sequence
    >>>