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If you want to keep things simple and are sure that, for all environments, you will be using the same dependencies, you can use just one file for your requirements named requirements.txt, generated by definition, as in the following:
(myproject_env)$ pip3 freeze > requirements.txt
To install the modules in a new virtual environment, simply call the following command:
(myproject_env)$ pip3 install -r requirements.txt
If you need to install a Python library from other version control system, or at a local path, you can learn more about pip from the official documentation at http://pip.readthedocs.org/en/latest/reference/pip_install.html.