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So much this! asyncio was the main selling point for me, but in general, why not follow the language?

I never really understood the "rather stay with py2.7" thing. I get it with big old monolithic applications. You don't "just" rewrite those, but _every new python project_ should be done with the latest stable release.

Is anyone starting their PHP projects on PHP4? Any new node projects in 0.10? Of course not, that would be moronic.

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Because you don't know what libraries you may depend on in the future when you start a new project. I was a fervent Python 3 supporter, and wrote every of my fresh projects in Python 3 instead of 2, until one day I found I needed LLVM in my project, yet the python port at that time was for 2 only.

I mostly avoid writing Python 3 nowadays, because I don't want to rewrite my project or find painstakingly an alternative solution when I could have just imported a module that runs fine under Python 2.

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