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I want to use the UltiSnips plugin in Vim 7.4 under Windows 10.
When enter :version I see that python is there, but when I launch gVim, it says in a dialog box
UltiSnips requires py >= 2.7 or py3`
How can I make my system compatible with UltiSnips (e. g. find a Vim distro with support for Python 2.7 or 3) ?
The problem comes from the fact that your Vim setup supports python, but python is not installed on your system.
When Vim has the 'python' and/or 'python3' features enabled that means that it provides an interface to interact with python code: you can make Vim to ask the system to execute a python statement or a whole python code.
Even if the interface is enabled, Vim is not a python compiler/executer: you still need to install them on your system so that Vim can make a call to these tools. See this page to get the executable to install python.
In the comments OP also had a question about which version of python (python2 or python3) to install:
Here python was needed to make UltiSnips working, as UltiSnips doesn't recommend a specific version I'd recommend to install whatever version you want, both should work. Remember that it is possible to install several version of python on the same system.
