Anaconda Python：如何安装缺少的依赖项？

Question

I am trying to install graph-tool from here: http://anaconda.org/vgauthier/graph-tool , using the command mentioned on that page.

I used the given command line:

conda install -c http://conda.anaconda.org/vgauthier graph-tool

and I get the following error:

Error: Could not find some dependencies for graph-tool: pixman

So I tried to install pixman in a similar way: http://anaconda.org/rwest/pixman .

conda install -c http://conda.anaconda.org/rwest pixman

This succeeded.

Yet the "could not find dependency" error is still there when trying to install graph-tool . Why does this happen and how can I fix it? There is no additional error message that I could go on.

Answer 1

Conda needs to be able to find all the dependencies at once. The -c flag only adds that channel for that one command. You would need to run conda install -c vgauthier rwest graph-tool . But an easier way is to add those channels to your configuration

conda config --add channels vgauthier --add channels rwest

Once you do this, you can just run

conda install graph-tool 

and it will grab things from those channels.

Answer 2

Conflicting dependencies for Anacona 2020.11

When setting up a fedora-33 virtual machine with Anaconda (Version 2020.11) in April 2021, I got conflicting dependencies, as graph-tool was not compatible with python version 3.8.5 . An pointed out here , the way to go is using a virtual environment with a supported version of python (3.7.9. in my case, as I still new from Anaconda version 2020.03).

In my case it was important to install Anaconda NOT as sudo . Otherwise some conda - alias was not set properly ( which conda should give an about 30 lines command with some if/else condition).

Here are the bash commands:

$ cd ~/Downloads/
$ wget https://repo.anaconda.com/archive/Anaconda3-2020.11-Linux-x86_64.sh
$ sudo chown -R user:user /opt/  # needed in my case to avoid sudo for installing Anaconda and calling conda later
$ bash Anaconda3-2020.11-Linux-x86_64.sh  # location: /opt/anaconda3, run conda init: yes
$ source ~/.bashrc  # make command conda available. Like restarting terminal in this case.
$ conda create -n envGraphTool anaconda python=3.7.9
$ conda activate envGraphTool
$ conda install -c conda-forge graph-tool

And a test if everything worked:

(envGraphTool) [user@f33 Downloads]$ which python
/opt/anaconda3/envs/envGraphTool/bin/python
(envGraphTool) [user@f33 Downloads]$ python -V
Python 3.7.9
(envGraphTool) [user@f33 Downloads]$ python
Python 3.7.9 (default, Aug 31 2020, 12:42:55) 
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import graph_tool as gt
>>> exit()
(envGraphTool) [user@f33 Downloads]$