PurpleDiane
Level 1 (8 points)

Q: Python 3.3.5 installation failed: no software found to install

I would like to install Python 3.3 for a project. I am unable to install either 3.3.5 64-bit or 32-bit version; I get the message installation failed because there was no software found to install. See image below

I already have Python 3.4 and 3.5 installed, but they were installed before I was forced to upgrade to El Capitan last month when the support people REFUSED to help me with a hardware problem  (the wifi hardware was bad) until I upgraded. I don't know if this is related to El Capitan or not.

I turned off the security that will only allow installation from the app store, but of course that didn't make any difference.

 

Is there any hope?

 

Screenshot 2016-05-12 20.06.46.png

MacBook Pro with Retina display, OS X El Capitan (10.11.4), 13-inch, 16 Gb

Posted on May 12, 2016 8:53 PM

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PurpleDiane

Q: Python 3.3.5 installation failed: no software found to install

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  • by Loner T,

    Loner T Loner T May 12, 2016 8:58 PM in response to PurpleDiane
    Level 7 (24,098 points)
    Safari
    May 12, 2016 8:58 PM in response to PurpleDiane

    Have you considered MacPorts as an option?

     

    You can disable SIP (About System Integrity Protection on your Mac - Apple Support) using and retrying your installation. Remember to enable SIP after the installation completes.

     

    1. Boot into Local Recovery (Command+R).

    2. Start Utilities -> Terminal.

    3. Type csrutil disable in Terminal and press Enter/Return.

    4. Type csrutil status.

    5. Boot normally, and type csrutil status to confirm that all individual entries are still disabled.

  • by etresoft,

    etresoft etresoft May 12, 2016 9:39 PM in response to PurpleDiane
    Level 7 (29,288 points)
    Mac OS X
    May 12, 2016 9:39 PM in response to PurpleDiane

    Hello PurpleDiane,

    The first thing you need to do is go back to System Preferences > Security and change that setting back to the default. Set "Allow apps downloaded from" to "Mac App Store and identified developers".

     

    This is not a System Integrity Protection issue. It is Python's inability to construct a proper installer. If you can't get this version from MacPorts or Homebrew, you will have to build it from source.

  • by PurpleDiane,

    PurpleDiane PurpleDiane May 12, 2016 10:50 PM in response to Loner T
    Level 1 (8 points)
    May 12, 2016 10:50 PM in response to Loner T

    Thanks so much for the information! I think this is what I will need.

     

    I have Homebrew, but homebrew docs are very confusing, so I'm still not sure how to install a specific version of Python with it. I probably just haven't managed to find the right page of docs.

     

    I am rethinking whether I really need 3.3 anyway. ;-)

     

    I actually never heard of MacPorts, so I'm looking into it in case I need it in the future. I'm fairly new to the Mac development ecosystem, so there is lots to learn! Though I *love* my MacBook Pro.

  • by PurpleDiane,

    PurpleDiane PurpleDiane May 12, 2016 11:13 PM in response to etresoft
    Level 1 (8 points)
    May 12, 2016 11:13 PM in response to etresoft

    etresoft:

    Yep. I may be ignorant about a lot of OSX stuff, but I'm not totally stupid. It's already changed back. ;-)