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Question: Why do I have two python3's installed (10.15.6)? /Library/Frameworks/Python.framework/Versions/3.8/bin/python3 ~/Library/Python/3.7/lib/python/ Is there any reason I should not delete the one in my userfolder, since no path points to it? And why is it there and not in the Frameworks folder?
Or alternatively, should I delete the one in the Frameworks folder and direct python to my userfolder?
The operating system will install Python 2.7.16 into System locations. Leave this alone, though note that Python 2.7 is end-of-life at Python.org. Perhaps as early as Big Sur, Apple has vowed to remove pre-installed Python, Ruby, and Perl scripting solutions from the operating system installation. When those changes take effect, Apple expects users to install their own solutions.
There is no need for a Python library in your local ~/Library, so purge that.
The /Library/Frameworks/Python.framework/Versions/3.8 is the result of using the python.org 3.8.n installer, and all of the binaries from this are linked into /user/local/bin/python3, idle3, etc. You can default access these by manipulating your PATH order.
Yes, the Xcode 11.n and command-line tools for Xcode 11.n installations now toss a reduced Python3 installation into System areas, and as long as the development tools are installed, it remains. I simply pretend that this cruft does not exist.
For the Python.org installation, if you already have the following PATH statement in your Bash ~/.bash_profile as:
export PATH=".:/usr/local/bin:$PATH"
the Python.org installer will later add the following to it:
PATH="/Library/Frameworks/Python.framework/Versions/3.8/bin:${PATH}"
with the PATH now set, when you interactively run python3, idle3, or pip3, you will be invoking only the python.org tools, and not Apple's /usr/bin/python3. Note, that with Zsh, that the python.org installer will not update the ~/.zshrc file, and you have to copy/paste from the Bash dot files.
Also, with #!/usr/bin/env python3 at the beginning of a Python script, and the preceding PATH adjustments, it uses the python.org python3 interpreter.
The operating system will install Python 2.7.16 into System locations. Leave this alone, though note that Python 2.7 is end-of-life at Python.org. Perhaps as early as Big Sur, Apple has vowed to remove pre-installed Python, Ruby, and Perl scripting solutions from the operating system installation. When those changes take effect, Apple expects users to install their own solutions.
There is no need for a Python library in your local ~/Library, so purge that.
The /Library/Frameworks/Python.framework/Versions/3.8 is the result of using the python.org 3.8.n installer, and all of the binaries from this are linked into /user/local/bin/python3, idle3, etc. You can default access these by manipulating your PATH order.
Yes, the Xcode 11.n and command-line tools for Xcode 11.n installations now toss a reduced Python3 installation into System areas, and as long as the development tools are installed, it remains. I simply pretend that this cruft does not exist.
For the Python.org installation, if you already have the following PATH statement in your Bash ~/.bash_profile as:
export PATH=".:/usr/local/bin:$PATH"
the Python.org installer will later add the following to it:
PATH="/Library/Frameworks/Python.framework/Versions/3.8/bin:${PATH}"
with the PATH now set, when you interactively run python3, idle3, or pip3, you will be invoking only the python.org tools, and not Apple's /usr/bin/python3. Note, that with Zsh, that the python.org installer will not update the ~/.zshrc file, and you have to copy/paste from the Bash dot files.
Also, with #!/usr/bin/env python3 at the beginning of a Python script, and the preceding PATH adjustments, it uses the python.org python3 interpreter.
AAANNNNDDD… I found a THIRD python at
/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/
Catalina is a big old mess.
Why do I have 2 Pythons installed?