[Python-Dev] Feature request: Change a Dependency Package Version During Package Initiation

[Daniel Holth]

This sounds exactly like what people used to do with eggs. You could have
multiple versions of a package on the path as eggs and then require a
version at runtime. The approach has problems. Ruby also abandoned a
strategy where random app code depends on package management code at
runtime.

One better strategy is to set up a python path in a wrapper script.

On Fri, May 17, 2019, 11:27 Brett Cannon <bcannon at gmail.com> wrote:

> Thanks for the idea but there are currently no plans to support such a
> feature. If you would like to see it then you will need to write a PEP with
> a proof-of-concept to demonstrate how you would expect such a feature to
> work.
>
> On Fri., May 17, 2019, 07:55 Q via Python-Dev, <python-dev at python.org>
> wrote:
>
>> A lot of the Python code we use in production are used directly as
>> imports in other python
>> distributions (such as the python comes with the finite element software
>> Abaqus and MSC Marc), many
>> packages (such as matplotlib, numpy) that may have varying versioned
>> dependencies.
>>
>> I was wondering if this could be expanded to allow a version to be set
>> within a package and have
>> that propagate to all modules in that package. For example in the root
>> init.py if I set
>> multiversion(tornado, 2.2.1) then all modules in that package will use
>> tornado 2.2.1 when I import
>> tornado.
>>
>> See a relevant issue on github:
>> https://github.com/mitsuhiko/multiversion/issues/1
>>
>> Thank you!
>> Qiang
>>
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