Nymphalidae, Acraea violae.
http://www.butterflycircle.com/checklist/mugshots/Acraea%20violae/earlystages/pupa/Tawny_Coster_pupa_01.jpg
https://www.flickr.com/photos/somnathpaldas2/5515907621/
Here the whole story:
https://www.flickr.com/photos/somnathpaldas2/sets/72157626240789530/with/5515907621/
Just for your understanding: Butterfly and Moth metamorphosal stages are often called pupa or pupae. The butterfly pupa is called chrysalis and the moth pupa is called a cocoon. So yours is actually a chrysalis.
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