while developing on localstack found out that the python version used is 2.7, while the docker-image uses version 3.6.8

as in the readme file I brought up my environment using:
```
make install
make infra
```
this will cause issues when touching parts different in these 2 major versions.

workaround:
```
make reinstall-p3
```
this changed the python version to 3.7.3 on debian 10, which is again above docker-image version...
dynamodb = aws_stack.connect_to_service('dynamodb')
                table_name = table_name_from_stream_arn(stream['StreamArn'])
                stream_name = get_kinesis_stream_name(table_name)
                stream_details = kinesis.describe_stream(StreamName=stream_name)
                table_details = dynamodb.describe_table(TableName=table_name)
                stream['KeySchema'] = table_details['Table']['KeySchema']
                
                
                stream_shards = stream_details['StreamDescription']['Shards']
                for shard in stream_shards:
                    shard['ShardId'] = shard_id(stream_name, shard['ShardId'])
                stream['Shards'] = stream_shards
                break
        if not result:
            return error_response('Requested resource not found', error_type='ResourceNotFoundException')
    elif action == '%s.GetShardIterator' % ACTION_HEADER_PREFIX:
        
        stream_name = stream_name_from_stream_arn(data['StreamArn'])
        stream_shard_id = kinesis_shard_id(data['ShardId'])
        result = kinesis.get_shard_iterator(StreamName=stream_name,
            ShardId=stream_shard_id, ShardIteratorType=data['ShardIteratorType'])
    elif action == '%s.GetRecords' % ACTION_HEADER_PREFIX:
        kinesis_records = kinesis.get_records(**data)
        result = {'Records': [], 'NextShardIterator': kinesis_records.get('NextShardIterator')}
        for record in kinesis_records['Records']:
            result['Records'].append(json.loads(to_str(record['Data'])))
    else:
        print('WARNING: Unknown operation "%s"' % action)
    return jsonify(result)
def error_response(message=None, error_type=None, code=400):