A pure-Python sha256 implementation, derived from Thom Dixon's pysha2. It should be compatible with versions of Python 2.3 and newer. pysha2 can be used as a standalone script or as a Python module. (However, those interested in using it as a Python module should look at using pysha2 instead, which is more flexible.)
$ pysha2 path_to_fileI needed to calculate hashes on a system that only has Python 2.3 available, which doesn't include any way to calculate sha256 hashes builtin.