diff --git a/monasca_analytics/banana/grammar/ast.py b/monasca_analytics/banana/grammar/ast.py
index fde6958..0e308e7 100644
--- a/monasca_analytics/banana/grammar/ast.py
+++ b/monasca_analytics/banana/grammar/ast.py
@@ -296,7 +296,7 @@ class Expr(ASTNode):
         if isinstance(expr_tree, p.ParseResults):
             expr_tree = expr_tree.asList()
         if isinstance(expr_tree, list):
-            for i in xrange(0, len(expr_tree)):
+            for i in range(0, len(expr_tree)):
                 if isinstance(expr_tree[i], list):
                     expr_tree[i] = Expr(span, expr_tree[i])
             self.expr_tree = expr_tree
diff --git a/monasca_analytics/banana/grammar/base_ast.py b/monasca_analytics/banana/grammar/base_ast.py
index 0885d7a..f3f8893 100644
--- a/monasca_analytics/banana/grammar/base_ast.py
+++ b/monasca_analytics/banana/grammar/base_ast.py
@@ -118,7 +118,7 @@ class Span(object):
             startcolno = 0
             endlineno = 0
             endcolno = 0
-            for lineno in xrange(0, len(splitted)):
+            for lineno in range(0, len(splitted)):
                 line = splitted[lineno]
                 if current_pos <= self.lo <= len(line) + current_pos:
                     startlineno = lineno + 1
@@ -139,7 +139,7 @@ class Span(object):
             splitted = self._text.splitlines()
             current_pos = 0
             lineno = 0
-            for _ in xrange(0, len(splitted)):
+            for _ in range(0, len(splitted)):
                 line = splitted[lineno]
                 if current_pos < self.lo < len(line) + current_pos:
                     return lineno + 1
diff --git a/monasca_analytics/banana/grammar/config.py b/monasca_analytics/banana/grammar/config.py
index 5b564d4..38f35a1 100644
--- a/monasca_analytics/banana/grammar/config.py
+++ b/monasca_analytics/banana/grammar/config.py
@@ -93,7 +93,7 @@ def banana_grammar(emitter=emit.PrintEmitter()):
     def action_create_connections(s, l, t):
         ast_conn = ast.into_connection(t[0])
         ast_conn.span = ast.make_span(s, l, t)
-        for i in xrange(1, len(t)):
+        for i in range(1, len(t)):
             next_conn = ast.into_connection(t[i])
             ast_conn.connect_to(next_conn, emitter)
         return ast_conn
diff --git a/monasca_analytics/ldp/monasca_aggregate.py b/monasca_analytics/ldp/monasca_aggregate.py
index 1cb4753..13f33b6 100644
--- a/monasca_analytics/ldp/monasca_aggregate.py
+++ b/monasca_analytics/ldp/monasca_aggregate.py
@@ -143,12 +143,12 @@ class MonascaAggregateLDP(bt.BaseLDP):
                 lambda x: x["metric"]["timestamp"], l),
             separated_metrics)
         metric_count = len(separated_metrics)
-        for index in xrange(0, len(separated_metrics[0])):
+        for index in range(0, len(separated_metrics[0])):
             new_value = reducer[0](
                 separated_metrics[0][index]["metric"]["value"],
                 metric_count)
             new_timestamp = separated_metrics[0][index]["metric"]["timestamp"]
-            for metric_index in xrange(1, metric_count):
+            for metric_index in range(1, metric_count):
                 new_value = reducer[1](new_value, helpers.interpolate(
                     new_timestamp,
                     separated_metrics[metric_index],
diff --git a/monasca_analytics/ldp/monasca_combine.py b/monasca_analytics/ldp/monasca_combine.py
index 371f8fa..aa46849 100644
--- a/monasca_analytics/ldp/monasca_combine.py
+++ b/monasca_analytics/ldp/monasca_combine.py
@@ -113,13 +113,13 @@ class MonascaCombineLDP(bt.BaseLDP):
             lambda l: map(
                 lambda x: x["metric"]["timestamp"], l[1]),
             separated_metrics)
-        for index in xrange(0, len(separated_metrics[0][1])):
+        for index in range(0, len(separated_metrics[0][1])):
             current_env = {
                 separated_metrics[0][0]:
                     separated_metrics[0][1][index]["metric"]["value"]
             }
             timestamp = all_timestamp[0][index]
-            for metric_index in xrange(1, len(separated_metrics)):
+            for metric_index in range(1, len(separated_metrics)):
                 metric_prop = separated_metrics[metric_index]
                 metric_name = metric_prop[0]
                 current_env[metric_name] = helpers.interpolate(
diff --git a/monasca_analytics/ldp/monasca_derivative.py b/monasca_analytics/ldp/monasca_derivative.py
index c93a7c2..e4bba80 100644
--- a/monasca_analytics/ldp/monasca_derivative.py
+++ b/monasca_analytics/ldp/monasca_derivative.py
@@ -116,7 +116,7 @@ class MonascaDerivativeLDP(bt.BaseLDP):
         last_timestamp = timestamps[0]
         tmp_all_values = [all_values[0]]
         tmp_timestamps = [last_timestamp]
-        for index in xrange(1, len(timestamps)):
+        for index in range(1, len(timestamps)):
             if timestamps[index] == last_timestamp:
                 continue
             else:
@@ -135,7 +135,7 @@ class MonascaDerivativeLDP(bt.BaseLDP):
             float(all_values[1] - all_values[0]) /
             float(timestamps[1] - timestamps[0])
         ]
-        for index in xrange(1, n):
+        for index in range(1, n):
             new_values.append(
                 float(all_values[index + 1] - all_values[index - 1]) /
                 float(timestamps[index + 1] - timestamps[index - 1])
diff --git a/test/ldp/test_monasca_aggregator.py b/test/ldp/test_monasca_aggregator.py
index 9f8b9bb..3748ef8 100644
--- a/test/ldp/test_monasca_aggregator.py
+++ b/test/ldp/test_monasca_aggregator.py
@@ -37,7 +37,7 @@ class TestMonascaAggregateLDP(MonanasTestCase):
         # iterable = map(lambda i: {"metric": {"value": i}}, iterable)
         cnt = len(iterable)
         acc = fn[0](iterable[0], cnt)
-        for index in xrange(1, cnt):
+        for index in range(1, cnt):
             acc = fn[1](acc, iterable[index], cnt)
         return acc