File Upload in Restful Flask

[subhabrata.banerji at gmail.com]

Dear Group,

I am trying to learn Rest framework through Restful Flask. 
My initial exercises went fine with https://flask-restful.readthedocs.org/en/0.3.3/quickstart.html

Now I want to upload file through Restful Flask. I tried to check the web for reference. 
I got these urls, 
(i) http://docs.python-requests.org/en/latest/user/quickstart/#post-a-multipart-encoded-file
(ii) http://stackoverflow.com/questions/28982974/flask-restful-upload-image
(iii) http://blog.luisrei.com/articles/flaskrest.html

But the question I am stuck with what are the things I have to change in the example of quickstart tutorial so that I may be able to upload file. Or if any one may kindly suggest with a small example. 

If any one of the esteemed members may kindly suggest. 

Regards,
Subhabrata Banerjee.