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| ReadFromText | |
| ------------ | |
| When you create a pipeline, you often need to read data from some external source, such as a file | |
| or a database. Likewise, you may want your pipeline to output its result data to an external | |
| storage system. Beam provides read and write transforms for a number of common data storage types. | |
| If you want your pipeline to read from or write to a data storage format that isn’t supported by | |
| the built-in transforms, you can implement your own read and write transforms. | |
| To read a PCollection from one or more text files, use beam.io.ReadFromText to instantiate a | |
| transform and specify the path of the file(s) to be read. | |
| **Kata:** Read the 'countries.txt' file and convert each country name into uppercase. | |
| <div class="hint"> | |
| Use <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.io.textio.html#apache_beam.io.textio.ReadFromText"> | |
| beam.io.ReadFromText</a>. | |
| </div> | |
| <div class="hint"> | |
| Refer to the Beam Programming Guide | |
| <a href="https://beam.apache.org/documentation/programming-guide/#pipeline-io-reading-data"> | |
| "Reading input data"</a> section for more information. | |
| </div> | |
| Built-in I/Os | |
| ------------- | |
| Beam SDKs provide many out of the box I/O transforms that can be used to read from many different | |
| sources and write to many different sinks. | |
| See the [Beam-provided I/O Transforms](https://beam.apache.org/documentation/io/built-in/) page | |
| for a list of the currently available I/O transforms. |