[PR] Add explicit warning if cython is not available in setup.py [beam]

Wed, 25 Mar 2026 12:35:19 -0700 


jrmccluskey opened a new pull request, #37953:
URL: https://github.com/apache/beam/pull/37953

   In current behavior, calling `python setup.py build_ext` will silently fail 
and not actually build any cythonized extensions if cython is not present in 
the current environment. This can be misleading while developing across 
multiple virtual environments and lead to changes to cythonized files not being 
exercised in tests. This adds a clear warning that extensions were not built, 
avoiding that issue.
   
   Looks like yapf also had opinions on the formatting of the rest of the file, 
which shouldn't actually impact any of our linting checks since those are 
scoped to the apache_beam subdirectory 
   
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