conda install downgrade python version

Question

I'm trying to downgrade python version of anaconda via conda install python=3.3, but have following error:

~/anaconda3/bin$ ./conda install python=3.3
Fetching package metadata .........
Solving package specifications: .


UnsatisfiableError: The following specifications were found to be in conflict:
  - gevent -> python 2.6*
  - python 3.3*
Use "conda info <package>" to see the dependencies for each package.

How to resolve conflicts with the packages?

Have you tried to run `conda uninstall gevent` first? – Markus Weber Jun 08 '18 at 11:37 — Markus Weber, Jun 08 '18 at 11:37

score 87 · Accepted Answer · answered Nov 14 '18 at 12:20

87

If you want to set specific version, use it like this:

WARNING: This command will overwrite the default python version system-wise

conda install python=3.6

To create environment with a specific version, you can do:

conda create -n $PYTHON36_ENV_NAME python=3.6 anaconda  # set custom env name

The anaconda at the end allows the env to use all anaconda packages

For more information refere to Anaconda documentation

answered Nov 14 '18 at 12:20

CermakM

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Hi. I did `conda install python=3.6.6` but got `3.6.9` installed. How to force conda to install requested version? – Confounded Nov 01 '19 at 14:00
This will not set it as default. – Ash Sep 29 '20 at 14:37
@CermakM, I think you are right, I want to downgrade python version in Spyder Anaconda from 3.8 to 3.7. I run following commands and a message shows IT MAY TAKE FEW MONUTES, but it is running and running (like half an hour) to solve conflicts: conda search python conda install python=3.7.0 – tursunWali Feb 20 '21 at 00:11
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well, this command is did not work for me: conda install python=3.7.0, in Spyder it is still shows Python 3.8.5. I gonna try : conda create --name py33 python=3.3 – tursunWali Feb 20 '21 at 00:15

JAdel · Answer 2 · 2023-05-18T22:43:26.220

There are two ways to downgrade python in anaconda.

1. Downgrade python in the active environment

(This can lead to conflicts with installed packages for higher python versions)

conda activate nameOfYourEnvironment
conda install python=3.3

2. Create a new environment

(This is a more safer way, but you need to reinstall all packages)

conda activate base
conda create --name env_name python=3.3

Hint: Use conda list before creating a new environment to get the names of all installed packages in the actual environment.

If you want to check your installed environments do:

conda env list

If you got problems in installing, make sure to run the shell as administrator (always recommended).

score 7 · Answer 3 · answered Apr 26 '17 at 11:12

7

You can make environments with other versions of Python using this command:

conda create --name py33 python=3.3
source activate py33

answered Apr 26 '17 at 11:12

ally-e

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But, I don't need environment, I need python 3.3 as default python installation. – mrgloom Apr 26 '17 at 11:16
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Using environments is the supporting way to use a different version of Python. You could also uninstall and reinstall Anaconda with a different Python version. – ally-e Apr 26 '17 at 16:48
This answer requires the least amount of effort. – Anshuman Kumar Feb 06 '20 at 08:31
The same as the above answer. – Ash Sep 29 '20 at 14:39

score 7 · Answer 4 · answered Sep 20 '20 at 18:48

7

Very firstly check the current version using command python --version. Then on anaconda prompt type the command conda search python which will list all the python versions available till date. Then from that list select your version and type conda install python=3.5.2 or any of your choice

answered Sep 20 '20 at 18:48

hrithikpy7336

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Thank you best way to change the versions – JK1185 Dec 09 '20 at 16:05
thanks. This is the nest answer so far for this query.... – Bhanu Chander Aug 21 '22 at 18:22

conda install downgrade python version

4 Answers4

1. Downgrade python in the active environment

2. Create a new environment

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