To package a conda environment (Requirement.txt and virtual environment)

condaenv.txt

# To create a conda environment:
conda create --name <environment-name> python=<version:2.7/3.5>

# To create a requirements.txt file:
conda list
conda list -e > requirements.txt 

# To export environment to a file:
activate <environment-name>
conda env export > <environment-name>.yml

# To import the exported environment:
conda env create -f <environment-name>.yml