Based on Yorgos Pagles's patch -
This makes it usable for django.core.files.uploadedfile.InMemoryUploadedFile which raises unsupported if you try to access fileno.
The difference is that it also doesn't break on older python (<= 2.5) without io
This pull request fixes poster for working properly with Django 1.5.
Cloudinary's Python library depends on poster. Therefore, we currently reference a Bitbucket fork instead of the official package.
Can you please merge this pull request and release a new pip package of poster?
The Cloudinary team