I'm looking for a good way to figure out the name of the conda environment I'm in from within running code or an interactive python instance.
The use-case is that I am running Jupyter notebooks with both Python 2 and Python 3 kernels from a miniconda install. The default environment is Py3. There is a separate environment for Py2. Inside the a notebook file, I want it to attempt to conda install foo
. I'm using subcommand
to do this for now, since I can't find a programmatic conda equivalent of pip.main(['install','foo'])
.
The problem is that the command needs to know the name of the Py2 environment to install foo
there if the notebook is running using the Py2 kernel. Without that info it installs in the default Py3 env. I'd like for the code to figure out which environment it is in and the right name for it on its own.
The best solution I've got so far is:
import sys
def get_env():
sp = sys.path[1].split("/")
if "envs" in sp:
return sp[sp.index("envs") + 1]
else:
return ""
Is there a more direct/appropriate way to accomplish this?
You want $CONDA_DEFAULT_ENV
or $CONDA_PREFIX
:
$ source activate my_env
(my_env) $ echo $CONDA_DEFAULT_ENV
my_env
(my_env) $ echo $CONDA_PREFIX
/Users/nhdaly/miniconda3/envs/my_env
$ source deactivate
$ echo $CONDA_DEFAULT_ENV # (not-defined)
$ echo $CONDA_PREFIX # (not-defined)
In python:
In [1]: import os
...: print (os.environ['CONDA_DEFAULT_ENV'])
...:
my_env
The environment variables are not well documented. You can find CONDA_DEFAULT_ENV
mentioned here:
https://www.continuum.io/blog/developer/advanced-features-conda-part-1
The only info on CONDA_PREFIX
I could find is this Issue:
https://github.com/conda/conda/issues/2764