Added a deprecation warning log to the Python 2 recipe during build

Author: inclement

pythonforandroid/recipes/python2/__init__.py

@@ -1,7 +1,7 @@
 from os.path import join, exists
 from pythonforandroid.recipe import Recipe
 from pythonforandroid.python import GuestPythonRecipe
-from pythonforandroid.logger import shprint
+from pythonforandroid.logger import shprint, warning
 import sh
 
 
@@ -57,6 +57,11 @@ def prebuild_arch(self, arch):
             self.apply_patch(join('patches', 'enable-openssl.patch'), arch.arch)
             shprint(sh.touch, patch_mark)
 
+    def build_arch(self, arch):
+        warning('DEPRECATION: Support for the Python 2 recipe will be '
+                'removed in 2020, please upgrade to Python 3.')
+        super().build_arch(arch)
+
     def set_libs_flags(self, env, arch):
         env = super(Python2Recipe, self).set_libs_flags(env, arch)
         if 'libffi' in self.ctx.recipe_build_order: