get rid of ugly xrange usage based on sys.version_info

Author: wojcikstefan

flask_mongoengine/operation_tracker.py

@@ -265,12 +265,7 @@ def _tidy_stacktrace():
 
     # Check html templates
     fnames = []
-    _range = None
-    if sys.version_info >= (3, 0):
-        _range = range(100)
-    else:
-        _range = xrange(100)
-    for i in _range:
+    for i in range(100):
         try:
             fname = sys._getframe(i).f_code.co_filename
             if '.html' in fname:

flask_mongoengine/pagination.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 import math
-import sys
 from flask import abort
 from mongoengine.queryset import QuerySet
 
@@ -103,8 +102,7 @@ def iter_pages(self, left_edge=2, left_current=2,
             {% endmacro %}
         """
         last = 0
-        range_func = range if sys.version_info >= (3, 0) else xrange
-        for num in range_func(1, self.pages + 1):
+        for num in range(1, self.pages + 1):
             if (
                 num <= left_edge or
                 num > self.pages - right_edge or