Add conda environment info to terminal prompt

To add to the answer by A.Wenn, this is what I added to my custom prompt

PS1=""

# Add conda environment to prompt
if [ ! -z "$CONDA_DEFAULT_ENV" ]
then
    PS1+="($CONDA_DEFAULT_ENV) "
fi

The method suggested in the comment from darthbith works very well. The variable $CONDA_DEFAULT_ENV is exactly what I was looking for:

>>> source activate myEnv

>>> echo $CONDA_DEFAULT_ENV
myEnv