Help while installing upgraded version of python

Python
1

This is not really related to the curriculum…
I’ve installed python3.9 yesterday on my windows 10…
Before installing I kept note of all the installed packages using pip freeze>req.txt.
Now after installing v3.9 I uninstalled python3.8.6 from control-panel>programs. it was all fine but I lost my installed packages.
So, today I was going to install all the packages with pip install -r req.txt but pip gave me error…
I fixed it by following folks on Stack Overflow, by deleting python38 directory…
But I’m unable to install them , I came across following error

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It would be good if someone guide me through whole procedure of shifting to another python version…

2

Delete python
Download python from their website. One version old , just to show you the process
Then upgrade via the cmd line. Do not delete the previous version.
Upgrade pip as well
I asked u to install the previous version just to show u the process. U don’t need to do it. But u have to do it this time
Upgrade pip if there’s an update.

Next time u want to upgrade just

Run the command to upgrade python version.
If it prompts to update the pip version just do it.

Hope It helps :grinning:

3

Hi @mukeshgurpude,
It seems like it’s trying to use some cached version of your libraries. This issue is not new on Windows 10 [see this] (https://github.com/pypa/pip/issues/8272).
Since Python 3.9 is ery new, it may introduce conflicting behaviours or incompatibilities with some of the libraries you have installed in your system.
Before considering rolling back to a 3.8.x version, I would try to completely remove all trace of python by uninstalling from the Control Panel as you did, AND, physically deleting the folders; specially site-packages. This would permit you a clean install. the caveat is, if you have python programs you need for some other tasks, you will need to reinstall their dependencies too!
Cheers,

4

How to upgrade python itself from command line, I’m unable to found such command in windows… Please guide me…

do you mean external packages, right?

5

Yes, exactly, your apps’ dependencies.

About upgrading python from the command line, there is no way on Windows to my knowledge if you use the standard installable from python.org. On a Mac, you can do this via homebrew. Maybe this is the way @gururajankappa refers to.

6

Reinstalled python cleared python39 folder in appdata, but still same problem

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7

Hi @mukeshgurpude,

I made the following 2 tests.
I first installed numpy on a virtual environment under python 3.8.5 and it worked.
screenshot.6

Then, I tried running the same configuration on a Docker container and it failed.

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This is a Linux debian image, so Windows is not the problem. I think there is some incompatibility between python 3.9 and numpy.

Can you downgrade to a earlier version of python? (You may want to wait until numpy release an update)

8

Actually, not only numpy there are many packages not optimized for python3.9…
Now I understood the importance of virtual environments for each project.

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9

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Is there a way to get notified about the package updates??

10

You can “watch” their Github. I can’t think of nothing better right now, sorry! But, this way, you’ll see on your Github “feed” when they release a new version.

1 Like