boto/boto — pull request #2081 by rivimey (2014-02-06 11:46:07+00:00)
Title: Extend read() method to support no-args and negative sizes (meaning readall)

This patch updates the read() method in the s3 transfer code to support read() as well as read(n). I wanted to be able to use the python zipfile code, which calls both forms, and the existing code fails with a syntax error when used this way.