FALSE ECONOMICS ALERT! FALSE ECONOMICS ALERT! FALSE ECONOMICS ALERT! You say that "most modules DO work when moving to a newer version of Python". However when they do not work, it is a lot of work diagnosing the problem and finding which module needs to have both versions installed in parallel.
It is better to spend the (relatively short and predictable) time maintaining a full virtualenv for each project. And if you are short on disk space, then today's disks are big and inexpensive - much less expensive than the time you spend trying to save few megabytes by not installing parallel versions. On Thu, 2021-07-22 at 20:02 +0300, Shlomo Solomon wrote: > On Thu, 22 Jul 2021 19:50:46 +0300 > Omer Zak <w...@zak.co.il> wrote: > > > Why do you want to avoid having to re-install modules for each > > version/environment? > > > The short answer: too much work > > The slightly longer answer: Although there are certainly changes > between versions of Python and/or modules, most modules DO work when > moving to a newer version of Python. I don't remember re-installing > everything when upgrading to a newer version of Python. > > But here, my problem is not upgrading, but keeping both versions. > > > > > > In the general case, a module version is compatible only with a > > subset > > of Python versions, due to API changes from Python version to > > Python > > version. > > > > You also want to let each project decide with which module version > > it > > wants to work, due to potential incompatibilities between module > > versions (it is no accident that pip freeze preserves installed > > module > > versions). > > > > > > On Thu, 2021-07-22 at 19:37 +0300, Shlomo Solomon wrote: > > > Omer Zak <w...@zak.co.il> wrote: > > > > The answer to your prayers is pyenv. > > > > It allows you to install multiple Python versions in parallel, > > > > and > > > > for > > > > each version you can maintain several virtualenvs. > > > > > > Dan Yasny <dya...@gmail.com> wrote: > > > > How about using virtualenv for alternative versions? > > > > > > Yes, I know about pyenv and virtualenv, but wouldn't I have to > > > re-install modules for each version/environment? That's what I'm > > > trying > > > to avoid. > > -- "Prior to capitalism, the way people amassed great wealth was by looting, plundering and enslaving their fellow man. Capitalism made it possible to become wealthy by serving your fellow man." - Walter E. Williams My own blog is at https://tddpirate.zak.co.il/ My opinions, as expressed in this E-mail message, are mine alone. They do not represent the official policy of any organization with which I may be affiliated in any way. WARNING TO SPAMMERS: at https://www.zak.co.il/spamwarning.html _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
