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

### Example of Sequence usage

    >>> from pysnmp.asn1 import univ
    >>> class MySequence(univ.Sequence):
    ...     fixedNames = [ 'myint', 'mystr' ]
    ...     fixedComponents = [ univ.Integer, univ.OctetString ]
    ...
    >>> s = MySequence()
    >>> s
    MySequence('myint'=Integer(0L), 'mystr'=OctetString(''))
    >>> s['myint'].set(10)
    >>> s['mystr'].set('foobar')
    >>> s.items()
    [('myint', Integer(10)), ('mystr', OctetString('foobar'))]
    >>> len(s)
    2
    >>> s['myint'] = univ.Boolean()
    Traceback (innermost last):
    ...
    pysnmp.asn1.error.BadArgumentError: Component type mismatch: Integer vs Boolean
    >>>