Problems installing

[jhaiduce]

It looks like pykep is unavailable for install through pip and the anaconda package has broken dependencies.

Pip:

$ venv/bin/pip install pykep
ERROR: Could not find a version that satisfies the requirement pykep (from versions: none)
ERROR: No matching distribution found for pykep

Anaconda (using a newly created conda environment):

$ conda config --add channels conda-forge
$ conda config --set channel_priority strict
$ conda install pykep
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: | 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.

...several hours later:

Examining conflict for matplotlib-base pykep pandas seaborn pyerfa h5py bokeh\ ^failed                                                                          

CondaError: KeyboardInterrupt

^C

My system is running Fedora 34 and has Python 3.9.5 installed.

[albertoibm]

@jhaiduce Did you try creating a new clean environment in conda? I have had problems with some packages (I think it was matplotlib but I'm not quite sure) with Python 3.9, you can create a new environment with Python 3.8 maybe?

[JJavierRosales]

I have also problems installing pykep library

$ conda config --add channels conda-forge
$ conda config --set channel_priority strict
$ conda install pykep
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.

PackagesNotFoundError: The following packages are not available from current channels:

  - pykep

Current channels:

  - https://conda.anaconda.org/conda-forge/osx-arm64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://repo.anaconda.com/pkgs/main/osx-arm64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/osx-arm64
  - https://repo.anaconda.com/pkgs/r/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

Did you manage to solve this issue? I am running Python 3.8.13 on a new Conda environment.

[darioizzo]

what architecture is your machine? I cannot reproduce this problem.

[JJavierRosales]

I am using ARM architecture (Apple silicon M1 Pro)

[darioizzo]

Than that is probably the reason ... not sure what happens with the M1 but it has issues with conda. Can you try to set the channel priority to false and try again?

[JJavierRosales]

Thanks @darioizzo for your suggestion, unfortunately it does not work either...

I raised this issue in the library where I originally found it (kesslerlib/kessler) and some contributors managed to get it working on M1 (issue)... Do you have any other suggestion I could try?

[bluescarni]

The conda recipe of pykep needs to be explicitly updated to enable support for ARM OSX, it is not an automatic process.

If I recall correctly, one has first to open a PR to conda-forge to add pykep to the list of ARM OSX packages. See here for an example:

conda-forge/conda-forge-pinning-feedstock#2708

Then a PR to the pykep feedstock will be opened automatically by a bot.

[JJavierRosales]

Thanks @bluescarni ! The PR that I did yesterday to conda-forge to include pykep on the osx-arm64.txt list has been successfully merged to the main branch.

Do you know what could be the lead-time for the PR to the pykep feedstock to be approved?

[bluescarni]

The PR to the pykep feedstock is open here:

conda-forge/pykep-feedstock#27

There seems to be an issue with the recipe, I think the problem is that make is not listed among the build time dependencies on unix. I cannot fix this directly though as I am not a maintainer of the recipe, guess we have to ping @darioizzo

[bluescarni]

@JJavierRosales the packages for osx arm64 should now be available.

[JJavierRosales]

@bluescarni That worked ! Thank you very much for your support.

[starkgate]

Same issue trying to install pykep with Python 3.11 on Windows 11 x64:

ERROR: Could not find a version that satisfies the requirement pykep (from versions: none)
ERROR: No matching distribution found for pykep

[DaedalusAerospaceOfficial]

failed to install with conda
`C:\Users\Administrator>conda config --add channels conda-forge
Warning: 'conda-forge' already in 'channels' list, moving to the top

C:\Users\Administrator>conda config --set channel_priority strict

C:\Users\Administrator>conda install pykep
Collecting package metadata (current_repodata.json): - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
\ DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
| DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
/ DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443

• DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  / DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/msys2/win-64/current_repodata.json HTTP/1.1" 304 0
• DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/msys2/noarch/current_repodata.json HTTP/1.1" 304 0
  \ DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/main/noarch/current_repodata.json HTTP/1.1" 304 0
  | DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/r/win-64/current_repodata.json HTTP/1.1" 304 0
  \ DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/r/noarch/current_repodata.json HTTP/1.1" 304 0
  | DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/main/win-64/current_repodata.json HTTP/1.1" 304 0
  done
  Solving environment: unsuccessful initial attempt using frozen solve. Retrying with flexible solve.
  Solving environment: unsuccessful attempt using repodata from current_repodata.json, retrying with next repodata source.
  Collecting package metadata (repodata.json): - DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): conda.anaconda.org:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): conda.anaconda.org:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
  DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): repo.anaconda.com:443
• DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/msys2/noarch/repodata.json HTTP/1.1" 304 0
  DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/main/win-64/repodata.json HTTP/1.1" 304 0
  DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/r/win-64/repodata.json HTTP/1.1" 304 0
  DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/main/noarch/repodata.json HTTP/1.1" 304 0
  \ DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/msys2/win-64/repodata.json HTTP/1.1" 304 0
  DEBUG:urllib3.connectionpool:https://repo.anaconda.com:443 "GET /pkgs/r/noarch/repodata.json HTTP/1.1" 304 0
  DEBUG:urllib3.connectionpool:https://conda.anaconda.org:443 "GET /conda-forge/win-64/repodata.json HTTP/1.1" 200 None
  DEBUG:urllib3.connectionpool:https://conda.anaconda.org:443 "GET /conda-forge/noarch/repodata.json HTTP/1.1" 200 None
  done
  Solving environment: unsuccessful initial attempt using frozen solve. Retrying with flexible solve.
  Solving environment: |`