How to add python dependencies to heroku node server?

I've solved it so:

I created (If there is not) the file "requirements.txt" directly into the root of the entrypoint (index.js, in my case)
I manually added the libraries with the specific versions into the file, in my case like this:
```
requests==2.7.0beautifulsoup4==4.5.3
```
I created (If there is not) the file "runtime.txt" with with just one line: the python version i need, in my case:
```
python-2.7.14
```

I created the multibuildpacks with the two commands:

heroku buildpacks:set heroku/pythonheroku buildpacks:add --index 1 heroku/nodejs

Finally, I continued with the git commands:

git add requirements.txt runtime.txtgit commit requirements.txt runtime.txt -m "requirements"git push heroku master

python node.js heroku dependencies

You probably need to use multiple buildpacks. See:

In the Heroku Dev Center.

CodeHunter