Conda/Mamba tips and tricks

Install Mamba on Conda

# prioritize 'conda-forge' channel
conda config --add channels conda-forge

# update existing packages to use 'conda-forge' channel
conda update -n base --all

# install 'mamba'
conda install -n base mamba

The environment is inconsistent, please check the package plan carefully. The following packages are causing the inconsistency

$conda install anaconda   # this command may take over an hour

# after then
$conda update --all

Unable to activate environment - even after ‘conda init’ and re-login to the shell

$ source activate base
$ conda deactivate

Update Python version for the conda env using mamba and yaml file

# environment.yml to update package inside of your environment
channels:
  - conda-forge
  - nodefaults
dependencies:
  - python >=3.10,<3.11
  - jupyterlab
  - numpy
  - scikit-learn
  - matplotlib-base # avoid qt if you can, if having trouble

$mamba env update -n <your env> --file environment.yml

Basic conda/mamba env setup in DLS framework

conda config --set auto_activate_base false
conda config --add channels r
conda config --add channels defaults
conda config --add channels bioconda
conda config --add channels conda-forge

How to fix InsecureRequestWarning: Unverified HTTPS request is being made to host

conda config --set ssl_verify false

conda: error: argument COMMAND: invalid choice: 'actiate'

# Try activate base 
$ source activate base
# Then deactivate it
(base) $ conda deactivate

# after then you can use activate command
$ conda activate base

Downgrading Conda Version

conda config --set allow_conda_downgrades true
conda install conda=a.b.c   # version you want to install

Speedup Conda

This page describes how to speed up conda operation

some examples are,

conda config --add channels bioconda

conda config --set channel_priority strict

conda config --set safety_checks disabled

Conda commands

Commands	Description	Options	Notes
conda update conda	update the conda package manager to the latest version
conda update anaconda	use conda to update Anaconda to the latest version
conda install anaconda=VERSION-NUMBER	use conda to install a specific version of Anaconda
conda config --add channels conda-forge	Add conda channel		Update channels section of ~/.condarc file
conda config --set channel_priority strict	Set channel priority policy
conda config --show-sources	Show config status
conda update --all --verbose	Update all conda with printout
conda list --show-channel-urls	Listup conda channels
conda search -f python	search available python version	Search can be extened with channels$ cat ~/.condarcchannels:- conda-forge- bioconda- defaults	Conda only has support for Python 3.8+ on the osx-arm64 To search alternative platforms, can use the --subdir, --platform argument to specify, $conda search --subdir osx-64 python=3.6 or set the subdir configuration temporarily through the CONDA_SUBDIR environment variable: CONDA_SUBDIR=osx-64 conda search python=3.6