A Developer's Guide to Python 3.0: Standard Library

"PEP 3108 - Standard Library Reorganization
"The Python standard library is one of the strongest libraries around and adequately supports Python's motto of "batteries included." But, over the years some cruft accumulated in the standard library. Python 3.0 takes full advantage of the fact that it's not backwardly compatible, using that lack of compatibility as a way to "clean house." PEP 3108 describes in detail the changes to the standard modules.

"Removed modules
"For Python 3.0, many older modules were simply removed. These were either already deprecated, or dropped because they weren't used often, or because better alternatives were already available in the standard library or in third-party packages. Many platform-specific modules were removed too, including:

"The dl module, which has been superseded by ctypes
The dircache module, which was rarely used and easily implemented
The ihooks module, because it was undocumented and used only by rexec (turned off in Python 2.3 due to security issues), which has now been removed as well.
popen2 is gone (use subprocess) as well as sets (use the builtin set and frozenset types)
md5 and sha are gone (use hashlib)"

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