PySNMP: Protocol: RFC 1902: Examples

### Example of rfc1902 module usage

    >>> from pysnmp.proto import rfc1902
    >>> s = rfc1902.ObjectSyntax(simple_syntax=rfc1902.SimpleSyntax())
    >>> s['simple_syntax']['string_value'] = rfc1902.OctetString('foobar')
    >>> s
    ObjectSyntax(simple_syntax=SimpleSyntax(string_value=OctetString('foobar')))
    >>> s.encode()
    '\004\006foobar'
    >>>
    >>> s2 = rfc1902.ObjectSyntax()
    >>> s2
    ObjectSyntax()
    >>> s2.decode(s.encode())
    ''
    >>> s2
    ObjectSyntax(simple_syntax=SimpleSyntax(string_value=OctetString('foobar')))
    >>>