Find the path to Python associated with a conda environment

Usage

conda_python(envname = NULL, conda = "auto", all = FALSE)

envname: The name of, or path to, a conda environment.
conda: The path to a conda executable. Use "auto" to allow reticulate to automatically find an appropriate conda binary. See Finding Conda and conda_binary() for more details.
all: Boolean; report all instances of Python found?