tests: cleanup version check

We do not support old Python versions anymore

Author: iMichka

Diff for: tests/example_tester_wrap.py

@@ -28,9 +28,6 @@
 sys.modules[__name__].__file__ = example_file
 
 # Run the example
-if sys.version_info[:2] >= (3, 0):
-    with open(example_file) as f:
-        code = compile(f.read(), example_file, "exec")
-        exec(code, None, None)
-else:
-    execfile(example_file)
+with open(example_file) as f:
+    code = compile(f.read(), example_file, "exec")
+    exec(code, None, None)