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pythonyamlversioncondaenvironment

How to create a new conda env based on a yml file but with different Python version

I have a conda environment with python=3.6.0 and all it's dependencies. Now I would like to use this yaml file to create another environment with the same dependencies but with python=3.7.0 without the need for installing the packages with right version one by one.

Solution 
  • # Activate old environment
conda activate so
# Save the list of package to a file:
conda list > log
# Extract the package name but not the version or hash
cat log | awk '{print $1}' > log2
# make the list of packages
tr '\n' ' ' < log2 > log3
# print the list of packages
cat log3

    Use notepad to replace python by python==3.7. Then create a new environment with the edited list of packages.

    conda create --name so2
conda activate so2
conda install _libgcc_mutex ... python==3.7 ... zstd

    Conda will try to install all packages with the same name but different version.