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A comment on Pipfile for Python. Parent comment

Re:Pipfile for Python by theptip on Tuesday November 22, 2016 @12:42PM (#13015791)
When do you need to do such conditional installing? (Aside from the `if dev: install dev-dependencies`, which is special-cased in npm and this proposal too).

Py2/3 compatibility? I've never had to do this, interested what the use-case is.

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Re:Pipfile for Python by yladiz on Tuesday November 22, 2016 @12:50PM (#13015872)
Github and Discourse did some conditional installation stuff when dealing with different versions of Rails. I don't remember the specifics of Discourse, but the Github one was due to their change from Rails 2.3 to Rails 3 and the different packages they needed to include in 2.3. This case is pretty minimal though and I haven't heard of many (any?) cases outside of those two.
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Re:Pipfile for Python by detaro on Tuesday November 22, 2016 @12:45PM (#13015814)
It might be useful for dependencies that are only available and/or required on some platform?
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