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https://issues.apache.org/jira/browse/BEAM-12730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17412719#comment-17412719
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Kenneth Knowles commented on BEAM-12730:
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Have someone asking about it: 
https://stackoverflow.com/questions/69113972/does-beam-supports-custom-delimiter-when-reading-from-text-file/69122348

> Add custom delimiters to Python TextIO reads
> --------------------------------------------
>
>                 Key: BEAM-12730
>                 URL: https://issues.apache.org/jira/browse/BEAM-12730
>             Project: Beam
>          Issue Type: New Feature
>          Components: io-py-common, io-py-files
>            Reporter: Daniel Oliveira
>            Priority: P2
>              Labels: beginner, newbie, starter
>
> A common request by users is to be able to separate a text files read by 
> TextIO with delimiters other than newline. The Java SDK already supports this 
> feature.
> The current delimiter code is [located 
> here|https://github.com/apache/beam/blob/v2.31.0/sdks/python/apache_beam/io/textio.py#L236]
>  and defaults to newlines. This function could easily be modified to also 
> handle custom delimiters. Changing this would also necessitate changing the 
> API for the various TextIO.Read methods and adding documentation.
> This seems like a good starter bug for making more in-depth contributions to 
> Beam Python.



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