This package will install Python $FULL_VERSION for Mac OS X $MACOSX_DEPLOYMENT_TARGET for the following architecture(s): $ARCHITECTURES.

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Update your version of Tcl/Tk to use IDLE or other Tk applications
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To use IDLE or other programs that use the Tkinter graphical user interface toolkit, you need to install a newer third-party version of the Tcl/Tk frameworks.  Visit https://www.python.org/download/mac/tcltk/ for current information about supported and recommended versions of Tcl/Tk for this version of Python and of Mac OS X.

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New Installation Options and Defaults
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For other changes in this release, see the Release Notes link for this release at https://www.python.org/downloads/.

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Python 3 and Python 2 Co-existence
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Python.org Python $VERSION and 2.7.x versions can both be installed on your system and will not conflict. Command names for Python 3 contain a 3 in them, python3 (or python$VERSION), idle3 (or idle$VERSION), pip3 (or pip$VERSION), etc.  Python 2.7 command names contain a 2 or no digit: python2 (or python2.7 or python), idle2 (or idle2.7 or idle), etc.  If you want to use pip with Python 2.7.x, download and install a separate copy of it from the Python Package Index (https://pypi.python.org/pypi/pip/).