learning/prompts/code-explanation/09_io_avro.md

Prompt:
What does this code do?
```python
class ReadAvroOptions(PipelineOptions):

@classmethod
def _add_argparse_args(cls, parser):
    parser.add_argument(
        "--path",
        help="GCS path to Avro file")

  options = ReadAvroOptions()

  with beam.Pipeline(options=options) as p:

    (p | "Read Avro" >> ReadFromAvro(options.path)
       | Map(logging.info))
```

Response:
This code reads data from [Apache Avro](https://avro.apache.org/) files using the `ReadFromAvro` transform from the built-in [AvroIO connector](https://beam.apache.org/releases/pydoc/current/apache_beam.io.avroio.html).

```python
class ReadAvroOptions(PipelineOptions):

@classmethod
def _add_argparse_args(cls, parser):
    parser.add_argument(
        "--path",
        help="GCS path to Avro file")

    options = ReadAvroOptions()
```

The `ReadAvroOptions` class defines the command-line argument `--path`, which specifies the path to the Avro file. To parse command-line arguments, this code uses [pipeline options](https://beam.apache.org/documentation/patterns/pipeline-options/).

```python
  with beam.Pipeline(options=options) as p:

    (p | "Read Avro" >> ReadFromAvro(options.path)
       | Map(logging.info))
```

The Apache Beam pipeline uses the `ReadAvroOptions` class to set the path to the Avro file and the [`ReadFromAvro` transform](https://beam.apache.org/releases/pydoc/current/apache_beam.io.avroio.html#apache_beam.io.avroio.ReadFromAvro) to read data from the file.