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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def pb2dict(obj):
 """ Takes a ProtoBuf Message obj and convertes it to a dict. """

    adict = {}
    if not obj.IsInitialized():
        return None
    for field in obj.DESCRIPTOR.fields:
        if not getattr(obj, field.name):
            continue
        if not field.label == FD.LABEL_REPEATED:
            if not field.type == FD.TYPE_MESSAGE:
                adict[field.name] = getattr(obj, field.name)
            else:
                value = pb2dict(getattr(obj, field.name))
                if value:
                    adict[field.name] = value
        else:
            if field.type == FD.TYPE_MESSAGE:
                adict[field.name] = \
                    [pb2dict(v) for v in getattr(obj, field.name)]
            else:
                adict[field.name] = [v for v in getattr(obj, field.name)]
    return adict