Properly check if python3 is available.

diraol · diraol · commit 6ceacc3a0901 · 2018-08-25T22:29:16.000-03:00
This fixes #938 and also closes #939. I haven't accepted #939 just because of the order of the logical conditions (it makes more sense to check for python3 and then if it is executable). Thanks to @kartynnik for the issue and Pull Request. I'm also adding you as a contributor.
diff --git a/AUTHORS b/AUTHORS
@@ -70,4 +70,5 @@ Contributors:
 * Wang Feng (https://github.com/mapler);
 * Wayne Ye (https://github.com/WayneYe);
 * Wes Turner (https://github.com/westurner);
+* Yury A. Kartynnik (https://github.com/kartynnik);
 * Xiangyu Xu (https://github.com/bkbncn);
diff --git a/plugin/pymode.vim b/plugin/pymode.vim
@@ -19,7 +19,7 @@ filetype plugin on
 " OPTIONS: {{{
 
 " Vim Python interpreter. Set to 'disable' for remove python features.
-if executable('python3')
+if has("python3") && executable('python3')
     call pymode#default('g:pymode_python', 'python3')
 else
     call pymode#default('g:pymode_python', 'python')
