Create new conda environment in google colab

I am in trouble while switching to my new env using colab. I successful created the env ‘new_env’ by

!conda create -n new_env python==x.x

and through

!conda env list

which prints

# conda environments:
#
base                     /usr/local
new_env              *  /usr/local/envs/new_env

I am sure I made it.

However, i can not use this new env. And finally, i find that

!source activate new_env && conda env list
!conda env list

will print

# conda environments:
#
base                     /usr/local
new_env              *  /usr/local/envs/new_env

# conda environments:
#
base                  *  /usr/local
new_env                 /usr/local/envs/new_env

and

%%bash
source activate new_env
conda env list

will print

# conda environments:
#
base                     /usr/local
new_env              *  /usr/local/envs/new_env

So, I realize that either should i add ‘source activate new_env &&’ before all bash commands or use ‘%%bash’.

By the way, it is even harder to install environment.yml in base environment.