Fails to install `ray` in conda env with python 3.7.4

System information

• OS Platform and Distribution: Linux Ubuntu 18.04
• Ray installed from: via pip in conda env
• Ray version: 0.7.3
• Python version: 3.6 and 3.7
• Exact command to reproduce:

Describe the problem

ray can be installed as part of a conda env when using python 3.6, but not with python 3.7.

Given the following environment.yml and install command I can install ray:

# environment.yml
name: ray_on_conda
channels:
  - defaults
dependencies:
  - python=3.6
  - pip
  - pip:
    - "ray==0.7.3"

conda env create -f envrionment.yml

If I use python 3.7, I can’t install ray:

# environment.yml
name: ray_on_conda
channels:
  - defaults
dependencies:
  - python=3.7
  - pip
  - pip:
    - "ray==0.7.3"

I get the following error:

...
Ran pip subprocess with arguments:                                                                                                                                           
['/home/user/anaconda3/envs/ray_on_conda/bin/python', '-m', 'pip', 'install', '-U', '-r', '/home/user/tmp/ray_on_conda/condaenv.l15tlbje.requirements.txt']              
Pip subprocess output:                                                                                                                                                       
8.3.0                                                                                                                                                                        
Collecting ray==0.7.3 (from -r /home/user/tmp/ray_on_conda/condaenv.l15tlbje.requirements.txt (line 1))                                                                    
                                                                                                                                                                             
Pip subprocess error:                                                                                                                                                        
  ERROR: Could not find a version that satisfies the requirement ray==0.7.3 (from -r /home/user/tmp/ray_on_conda/condaenv.l15tlbje.requirements.txt (line 1)) (from version
s: none)                                                                                                                                                                     
ERROR: No matching distribution found for ray==0.7.3 (from -r /home/user/tmp/ray_on_conda/condaenv.l15tlbje.requirements.txt (line 1)) 

Note that a direct pip install ray in the conda env with python 3.7 also fails. If I create a virtualenv with python 3.7 virtualenv -p python3.7 I can run pip install ray.

[nasrin136]

Hi. I am having this issue with python=3.9.5, on MacOS 11.3.1. I get: Pip subprocess error: ERROR: Could not find a version that satisfies the requirement ray[all]>=1.2 (from versions: none) ERROR: No matching distribution found for ray[all]>=1.2 my environment.yml channels:

• defaults dependencies:

• pandas=1.2.4

• pip=21.1.1

• plotly=4.14.3

• python=3.9.5

• pip:

  • numpy==1.19.5
  • tensorflow==2.5.0
  • ray[all] >= 1.2 the problem disappears with I changed python =3.7.4

[sotte]

Thanks @simon-mo!