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@ -13,42 +13,41 @@ factors that make it harder to port them than most code:
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Which version of Python-3.x and which version of Python-2.x are our minimums?
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=============================================================================
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The short answer is Python-3.4 and Python-2.4 but please read on for more
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The short answer is Python-3.5 and Python-2.4 but please read on for more
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information.
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For Python-3 we are currently using Python-3.4 as a minimum. However, no long
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term supported Linux distributions currently ship with Python-3. When that
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occurs, we will probably take that as our minimum Python-3 version rather than
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Python-3.4. Thus far, Python-3 has been adding small changes that make it
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more compatible with Python-2 in its newer versions (For instance, Python-3.5
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added the ability to use percent-formatted byte strings.) so it should be more
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pleasant to use a newer version of Python-3 if it's available. At some point
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this will change but we'll just have to cross that bridge when we get to it.
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For Python-2 the default is for modules to run on Python-2.4. This allows
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users with older distributions that are stuck on Python-2.4 to manage their
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machines. Modules are allowed to drop support for Python-2.4 when one of
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their dependent libraries require a higher version of python. This is not an
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invitation to add unnecessary dependent libraries in order to force your
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module to be usable only with a newer version of Python. Instead it is an
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acknowledgment that some libraries (for instance, boto3 and docker-py) will
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only function with newer Python.
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For Python-3 we are currently using Python-3.5 as a minimum on both the
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controller and the managed nodes. This was chosen as it's the version of
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Python3 in Ubuntu-16.04, the first long-term support (LTS) distribution to
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ship with Python3 and not Python2. Much of our code would still work with
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Python-3.4 but there are always bugfixes and new features in any new upstream
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release. Taking advantage of this relatively new version allows us not to
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worry about workarounds for problems and missing features in that older
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version.
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For Python-2, the default is for the controller to run on Python-2.6 and
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modules to run on Python-2.4. This allows users with older distributions that
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are stuck on Python-2.4 to manage their machines. Modules are allowed to drop
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support for Python-2.4 when one of their dependent libraries require a higher
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version of python. This is not an invitation to add unnecessary dependent
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libraries in order to force your module to be usable only with a newer version
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of Python. Instead it is an acknowledgment that some libraries (for instance,
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boto3 and docker-py) will only function with newer Python.
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.. note:: When will we drop support for Python-2.4?
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The only long term supported distro that we know of with Python-2.4 is
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RHEL5 (and its rebuilds like CentOS5) which is supported until April of
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2017. We will likely end our support for Python-2.4 in modules in an
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Ansible release around that time. We know of no long term supported
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distributions with Python-2.5 so the new minimum Python-2 version will
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likely be Python-2.6. This will let us take advantage of the
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forwards-compat features of Python-2.6 so porting and maintainance of
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Python-2/Python-3 code will be easier after that.
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RHEL5 (and its rebuilds like CentOS5) which is supported until April of
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2017. Whatever major release we make in or after April of 2017 (probably
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2.4.0) will no longer have support for Python-2.4 on the managed machines.
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Previous major release series's that we support (2.3.x) will continue to
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support Python-2.4 on the managed nodes.
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.. note:: Ubuntu 16 LTS ships with Python 3.5
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We know of no long term supported distributions with Python-2.5 so the new
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minimum Python-2 version will be Python-2.6. This will let us take
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advantage of the forwards-compat features of Python-2.6 so porting and
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maintainance of Python-2/Python-3 code will be easier after that.
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We have ongoing discussions now about taking Python3-3.5 as our minimum
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Python3 version.
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Supporting only Python-2 or only Python-3
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=========================================
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@ -152,7 +151,7 @@ dealing with file permissions. (With file permissions a user may be feeding
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the mode into another program or to another module which doesn't understand
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the python syntax for octal numbers. ``[zero][digit][digit][digit]`` is
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understood by most everything and therefore the right way to express octals in
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these cisrcumstances.
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these circumstances.
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Bundled six
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-----------
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Toshio Kuratomi
8 years ago
committed by