Mostly they write the same way people in English-speaking countries do. You don’t have to know very much actual English to be able to code (programming languages are by nature a lot smaller and *much* simpler than any natural language, especially English) so the barrier to entry has generally been thought to be relatively low. Programming languages *have* been made that use keywords and structures from other languages, but by and large they haven’t really caught on, partly because they haven’t managed to get the support of the English-speaking community of programmers.
In more recent times, prigramming languages have started supporting Unicode in their code files. Thus, even in languages where the code uses English words, comments and annotations can be written in any language. This isn’t perfect, but it helps a lot.
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