create a requirements.txt code example
Example 1: command to make requirements.txt
pip freeze > requirements.txt
Example 2: pip freeze requirements.txt
$ env1/bin/pip freeze > requirements.txt
$ env2/bin/pip install -r requirements.txt
Example 3: python generate requirements.txt
# First:
pip install pipreqs
# Then:
pipreqs path/to/project
# There is now a requirements.txt file in the project folder.
Example 4: how to create a requirements.txt python
# Exit the current venv
(shiny_new_env)$ conda deactivate
# Spin up a new one
$ conda create -n env_2 python=3.4
# Activate it
$ conda activate env_2
# Install from our fancy new file
(env_2)$ pip install -r requirements.txt