Don't use python_version directly on evaluator anymore

jedi/evaluate/__init__.py

@@ -62,8 +62,6 @@ only *evaluates* what needs to be *evaluated*. All the statements and modules
 that are not used are just being ignored.
 """
 
-import sys
-
 from parso.python import tree
 import parso
 
@@ -104,7 +102,6 @@ class Evaluator(object):
         self.analysis = []
         self.dynamic_params_depth = 0
         self.is_analysis = False
-        self.python_version = sys.version_info[:2]
         self.project = project
         self.access_cache = {}
         project.add_evaluator(self)