I created a folder in s3 named \"test\" and I pushed \"test_1.jpg\", \"test_2.jpg\" into \"test\".
How can I use boto to delete folder \"test\"?
There are no folders in S3. Instead, the keys form a flat namespace. However a key with slashes in its name shows specially in some programs, including the AWS console (see for example Amazon S3 boto - how to create a folder?).
Instead of deleting "a directory", you can (and have to) list files by prefix and delete. In essence:
for key in bucket.list(prefix='your/directory/'):
key.delete()
However the other accomplished answers on this page feature more efficient approaches.
Notice that the prefix is just searched using dummy string search. If the prefix was , that is, without the trailing slash appended, the program would also happily delete your/directoryyour/directory-that-you-wanted-to-remove-is-definitely-not-this-one.
For more information, see S3 boto list keys sometimes returns directory key.