That's true that you should absolutely not change the system Python installation. But if you install Python 3 from source, it will not overlap with the system Python, even if you made the mistake of configuring into /usr/bin et al since all of the Python 3 files installed are designed to not conflict with Python 2 names, i.e.

• How To Change Default Python Version Mac

They all have a 3 in them. Even better on Mac OS X is to configure Python framework ( -enable-framework) builds which allow multiple minor versions of Python 2's and/or Python 3's to co-exist easily. – Apr 22 '11 at 8:17. If you are reading the Apple-supplied Python man page ( man python) on Mac OS X 10.6 (Snow Leopard), be aware that it is incorrect: Apple did not ship a Python 3.0 with 10.6.

You'll need to install a Python 3 version yourself. The easiest way is to use a. But you can also use MacPorts or Homebrew or do it yourself. Also, be aware that support for Python 3.0 was dropped immediately with the release of Python 3.1.

How To Change Default Python Version Mac

Python 3.2 is now current. However you install it, the Python 3 interpreter will be available as either python3 or python3.2. It does not conflict with Python 2 ( python). You may need to adjust your shell PATH though. The python.org installer will do that for you; follow the installation instructions.

I would first install Xcode on my machine (it comes on the installation disc that came with your computer). Then run Software Update to bring it up to date (at least to the most-current free version). Then, download the Python 3.x source code and extract it. Do './configure', 'make' and 'sudo make install' in that directory. These will install the new Python installation in /usr/local/bin (and other nearby places). If all goes well, /usr/local/bin/python will be a Python 3 interpreter you can use. I would hesitate to overwrite the installed version of Python, since that might make trouble for python scripts shipped with the operating system.

I never install anything in /usr; I let Software Update take care of that. For all the rest of my software needs, the './configure. Sudo make install' technique works very well on Snow Leopard once Xcode is installed.

Check for Python 2.7 Course Builder requires Python 2.7 (versions 2.7.0 - 2.7.10). To determine whether you have Python 2.7 installed, follow the instructions for your system:. On a Mac Most Macs come with Python 2.7 already installed, but it’s good to double-check the version.

To determine whether you have Python 2.7, open the Terminal application, type the following, and press Return: python -V This command will report the version of Python: Python 2.7.3 Any version between 2.7.0 and 2.7.10 is fine. If you have a different version of Python (earlier or later) or if you do not get a response to the command at all, then you should. Find and select the Mac OS X installer file that matches your system. The file will download, and opening it will begin the installation. On Windows 7 To get to the command line, open the Windows menu and type “command” in the search bar. Select Command Prompt from the search results. In the Command Prompt window, type the following and press Enter.

Python If Python is installed and, then this command will run python.exe and show you the version number. Python 2.7.4 (r264:75708, Oct 10 2009, 07:36:50) MSC v.1500 64 bit (AMD64) on win32 Type 'help', 'copyright', 'credits' or 'license' for further information.

Otherwise, you will see: 'python' is not recognized as an internal or external command, operable program or batch file. In this case, you need to and then. Download and install Python 2.7.10 for Windows Go to Find and download the Windows installer file that matches your system. Open the file to start the installation wizard.

Follow the instructions and make a note of where Python is installed on your system. Add Python to path In the Windows menu, search for “advanced system settings” and select View advanced system settings.

In the window that appears, click Environment Variables near the bottom right. In the next window, find and select the user variable named Path and click Edit to change its value. The value for this variable is a semi-colon-delimited list of file locations. Scroll to the end of the value, add a semi-colon, and then add the location of python.exe.

(If you do not know where your python.exe is, you can.) Click OK to save this change. If you do not have a user variable named Path, click the New button. Add a variable named Path and make its value the location of python.exe. Finding python.exe If you do not know where Python was installed, search for python.exe in the Windows menu.

Right-click the file name in the results, select Properties, and find Location. Copy the location and add it to your path variable. Confirm addition to path Open a new command prompt and re-run the original command: python to confirm that Python 2.7.10 is installed and added to your path. If you are using Linux or another POSIX-compliant system On Linux or other POSIX-compliant systems, open a shell and type which python If Python is installed, you will get back its location, which may or may not include the version number.

If the location does not include a version number, then ask for it: python -V This command returns the version Python 2.7.3 If you do not have Python 2.7 installed, you can get it from.