Pygraphviz for python 3.9?

[brando90]

I tried to install but got this error:

(base) miranda9@Brandos-MBP envs % conda install -y pygraphviz
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.                                                                                                                                                                                                                                                                                                             failed                                                                                                                                                                                                                                                                                                                                                                 

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

Specifications:

  - pygraphviz -> python[version='>=2.7,<2.8.0a0|>=3.6,<3.7.0a0|>=3.7,<3.8.0a0|>=3.5,<3.6.0a0']

Your python: python=3.9

If python is on the left-most side of the chain, that's the version you've asked for.
When python appears to the right, that indicates that the thing on the left is somehow
not available for the python version you are constrained to. Note that conda will not
change your python version to a different minor version unless you explicitly specify
that.

is it due to me using python 3.9? Can we get support for it?

[brando90]

is this issue solved by doing conda install -y pygraphviz -c conda-forge?

[dschult]

You should use the conda-forge collection of conda packages.

conda install -c conda-forge pygraphviz

[rossbar]

FWIW #333 adds an explanation to the docs about which conda channels to use, and adds a CI cronjob + badges to guarantee that the conda builds for supported Python versions are working. This improvement in the install docs may help users avoid issues like these.

[brando90]

related? https://stackoverflow.com/questions/67509980/how-does-one-install-pygraphviz-on-a-hpc-cluster-without-errors-even-when-graphv

[brando90]

@dschult why does conda with coda-forge work but not when I try to install my project with pip install -e .? this proj: https://github.com/brando90/ultimate-utils

Due to a depedency on pygraphviz you will likely need to install graphviz first. Next, install graphviz. On mac, brew install graphviz. On Ubuntu, sudo apt install graphviz. After graphviz is install, install uutils in edibable mode and all it's depedencies with pip:

pip install -e ~/ultimate-utils/ultimate-utils-proj-src

[dschult]

conda installs both graphviz and pygraphviz while pip tries to find graphviz on your computer and install pygraphviz to link to it. At least that is my probably poor attempt to describe what happens. Anyway, conda with conda-forge is able to find graphviz when installing pygraphviz. pip may or may not be able to find graphviz when installing pygraphviz.