[Python-ideas] Moving typing out of the stdlib in Python 3.7?

[Lukasz Langa]

> On 5 Nov, 2017, at 10:30 PM, Michel Desmoulin <desmoulinmichel at gmail.com> wrote:
> 
> Le 06/11/2017 à 07:07, Nick Coghlan a écrit :
> 
>> It's the default on Unix as well - you have to do "make install
>> ENSUREPIP=no" to avoid getting it. (And some distros also modify their
>> Python installations so that pip is missing by default)
> 
> On debian and derivatives (so Ubuntu) you need to install python-pip to
> be able to use pip.
> 
> Now it's annoying already. Because you have to write every tutorial to
> include a special case for them. But at least it's not a required step
> to run your program.
> 
> However, if you do code using type hints and typing is not installed,
> you can't even run the program without installing something. So we
> finally have Python 3 by default on most Linux system, but still would
> not be able to assume we can run a modern script on it.

This is a valid concern. Although this particular problem is self-inflicted by Debian, I can understand their rationale behind explicit packaging. They need to have control over the entire package graph. I wonder if there's a way in .deb to specify a required installed package. I'm not calling it a "dependency" since obviously it would rather be "python3-typing" that depends on "python3". Barry, do you know?

But even if Debian installs python3-typing by default, will "pip install -U typing" be possible in this scenario? I guess it wouldn't be terrible if that only worked in virtualenvs, although ideally it would work also for the raw host installation.

- Ł
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