4/6/2023 0 Comments Python for mac os sierra![]() The system version needs to be left alone, exactly as any apps or system software that might need it expects it to be. The system version, the 2.7 version, and the 3.6 version – and that these need to be kept isolated from one another so libraries and packages for one don’t mix in and corrupt those for another. As you dig into creating your Python coding environment properly for you Mac, you find out that you’ll need to have 3 (at minimum) versions of Python running. Python v.3.6 is not backward compatible with code written for 2.7 – which is a lot of code! And Python v.2.7 will not run all code written for 3.6 – also a lot of code, and the current and growing version. Furthermore, at the current time (August, 2017) there are two versions of Python in heavy use, 2.7 and 3.6. ![]() Also, adding third party libraries to the system version of Python is a repetitive pain of telling your Mac it’s OK every time and making sure all permissions end up in correct mode. Apple may not keep the runtime environment up to date, but when they do upgrade the OS, the upgrade may wipe out all the site packages you’ve added to the preinstalled version of Python. But, that install turns out to be rather useless for coding in Python. ![]() It’s true that Python does come preinstalled on a Mac. Some python 3 features have been back ported to python 2.Making yourself a workspace on your Mac to start writing Python code doesn’t even seem necessary at first glance, since Python comes with MacOS X. There are enough language version differences between python 2.7.14 and python 3.6.5 (presently) that depending on the particular library module used, that code that you write for python 2.7.n will not work with python 3.6.n without some planning. When you are done, and want to run the operating system python again, you unset the PYTHONPATH environment variable as: $ export PYTHONPATH=/Library/Frameworks/amework/Versions/3.6/libĪnd then you could launch Python 3.6.5, or idle3 as: So as above, if you wanted to run the Python 3.6.5 that you installed with 's installer, you set the path to the dynamic framework library as: above), you must set this environment variable as the path to the specific Python version library. But, when you install different Python versions (e.g. This, and other environment variables are discussed in the python documentation at. ![]() With the System python installation, the environment variable PYTHONPATH is unset. Library/Frameworks/amework/Versions/3.6/lib The alternate python installation choices usually put the python and idle binaries in /usr/local/bin, and shove the respective python version library into (for example, Python 3.6.5) at the following location: Note: I launch idle as a Bash background (&) task to free up the Terminal. You use control-d to exit the idle utility. $ python -c 'print("".format("Monty Python"))' # launch the default python 2.7.10 interactive development environment (IDE) The python installed by the operating system is /usr/bin/python.Īssuming that you have the proper (default) PATH environment variable setting, then you should be able to just type the following (in blue) from the Terminal command-line: homebrew), or install from the installer to keep the python versions separate. Never remove, and/or replace the System installed python as several operating system components depend on this specific 2.7.10 version of Python.
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