On Planet Python, Gregory Szorc asks why many projects continue to support Python releases prior to 2.7, when they are all EOLed (2.4 in 2008, 2.5 in 2011, and 2.6 last October), and Python 2.7 provides a clear upgrade path to Python 3. Quoting: "I think maintainers of Python projects should seriously consider dropping support for Python 2.6 and below. Are there really that many people on systems that don't have Python 2.7 easily available? Why are we Python developers inflicting so much pain on ourselves to support antiquated Python releases? As a data point, I successfully transitioned Firefox's build system from requiring Python 2.5+ to 2.7.3+ and it was relatively pain free." Shortly after posting, other developers responded with their reasons for using older Python releases. First, Rob Galanakis of CCP (EVE Online) explains the difficulties involved in upgrading a mature commercial project embedding Python. Nathan Froyd adds "I think this list of reasons to upgrade misses the larger point in providing software for other people: You do not get to tell your users what to do. ... Maybe those users don’t have sufficient control over their working environments to install a new version of Python. ... Maybe those users rely on certain APIs only available in older versions of Python and don’t wish to take an indeterminate amount of time to rewrite (retest, recertify, etc. etc.) their software. ... Maybe those users are just rationally lazy and don’t want to deal with downloading, configuring, and installing a new version of Python, plus dealing with inevitable fallout, when the old version has worked Just Fine for everything else."
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