Remove getCallback indirection in modules
Instead, assume that the imported module contains the Callback class
that was previously returned by getCallback. This is done to prevent
a circular import (caused by the __init__ importing a submodule).
"""
The md5 and sha modules are deprecated since Python 2.5, replaced by the
hashlib module containing both hash algorithms. Here, we provide a common
interface to the md5 and sha constructors, preferring the hashlib module when
available.
"""
try:
import hashlib
md5_constructor = hashlib.md5
sha_constructor = hashlib.sha1
except ImportError:
import md5
md5_constructor = md5.new
import sha
sha_constructor = sha.new