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Yeah, I guess I should have done a pip freeze to specify the versions in the requirements file. I wasn't thinking ahead.

Turns out one dependency had 3 major releases in the span of a year! (Which basically confirms what I was saying, though I don't know how typical that is.)

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3rd party package maintainers usually don't do as good a job of maintaining backwards compatibility or doing it right as do the core library maintainers, thats why you were able to upgrade from 2 to 3 by changing print to print() but then sometimes dependencies you install with pip break for inexplicable reasons.

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