generate requirements.txt from pip code example

Example 1: pip install from requirements.txt

$ pip install -r requirements.txt

Example 2: pip freeze requirements.txt

$ env1/bin/pip freeze > requirements.txt
$ env2/bin/pip install -r requirements.txt

Example 3: install requirements.txt in pip command

note: yor should be on the same dir as requirements.txt file 

pip install -r requirements.txt

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

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