How to deal with infinite iterators / generators ? about reticulate

[terrytangyuan]

Thanks for the report! This is indeed something we are missing. I imagine we can add an S3 method next() that works on iterator/generator objects. @jjallaire Do you see any potential problems?

[jjallaire]

Good catch! Just added an iter_next function for this. Docs are here: https://rstudio.github.io/reticulate/articles/introduction.html#element-level-iteration

[nakamichiworks]

Thank you for a very quick fix !

[jjallaire]

Note that the default completed value for iter_next has just changed from NA to NULL (although you can always use the completed parameter to change this). Here are the update docs: https://rstudio.github.io/reticulate/articles/introduction.html#iterators

If you want to write code that works correctly with both the current version of reticulate on CRAN and the next version (master) just explicitly specify completed = NA rather than relying on the default.

Note that this change was made as part of adding support for creating generators (Python iterators implemented as R functions). Docs on generators are here: https://rstudio.github.io/reticulate/articles/introduction.html#generators