In order to run python with multiple environments first download Anaconda.
Then create a new conda environment
conda create -n shiny_new_env python=3.4
Then list the current created environments
conda env list
Then activate the environment
conda activate shiny_new_env
Now create a new clean requirement txt file
pip freeze > requirements.txt
To exit this environment
conda deactivate
Run the following code if pip installation conflicts are giving you trouble.
conda install -r requirements.txt