diff --git a/moto/ec2/exceptions.py b/moto/ec2/exceptions.py
index 453f75d1d..b7a49cc57 100644
--- a/moto/ec2/exceptions.py
+++ b/moto/ec2/exceptions.py
@@ -524,6 +524,7 @@ class OperationNotPermitted3(EC2ClientError):
                                                                                            acceptor_region)
         )
 
+
 class InvalidLaunchTemplateNameError(EC2ClientError):
     def __init__(self):
         super(InvalidLaunchTemplateNameError, self).__init__(
diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index 2310585ac..3cb0bad93 100644
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -19,8 +19,6 @@ from boto.ec2.instance import Instance as BotoInstance, Reservation
 from boto.ec2.blockdevicemapping import BlockDeviceMapping, BlockDeviceType
 from boto.ec2.spotinstancerequest import SpotInstanceRequest as BotoSpotRequest
 from boto.ec2.launchspecification import LaunchSpecification
-from xml.etree import ElementTree
-from xml.dom import minidom
 
 from moto.compat import OrderedDict
 from moto.core import BaseBackend
@@ -4115,6 +4113,7 @@ class NatGatewayBackend(object):
     def delete_nat_gateway(self, nat_gateway_id):
         return self.nat_gateways.pop(nat_gateway_id)
 
+
 class LaunchTemplateVersion(object):
     def __init__(self, template, number, data, description):
         self.template = template
@@ -4123,6 +4122,7 @@ class LaunchTemplateVersion(object):
         self.description = description
         self.create_time = utc_date_and_time()
 
+
 class LaunchTemplate(TaggedEC2Resource):
     def __init__(self, backend, name, template_data, version_description):
         self.ec2_backend = backend
@@ -4144,10 +4144,10 @@ class LaunchTemplate(TaggedEC2Resource):
         return self.default_version == version.number
 
     def get_version(self, num):
-        return self.versions[num-1]
+        return self.versions[num - 1]
 
     def default_version(self):
-        return self.versions[self.default_version_number-1]
+        return self.versions[self.default_version_number - 1]
 
     def latest_version(self):
         return self.versions[-1]
@@ -4163,6 +4163,7 @@ class LaunchTemplate(TaggedEC2Resource):
             return super(LaunchTemplate, self).get_filter_value(
                 filter_name, "DescribeLaunchTemplates")
 
+
 class LaunchTemplateBackend(object):
     def __init__(self):
         self.launch_templates_by_name = {}
diff --git a/moto/ec2/responses/launch_templates.py b/moto/ec2/responses/launch_templates.py
index ebce54294..d1bfaa6d4 100644
--- a/moto/ec2/responses/launch_templates.py
+++ b/moto/ec2/responses/launch_templates.py
@@ -1,4 +1,3 @@
-import json
 import six
 import uuid
 from moto.core.responses import BaseResponse
@@ -19,6 +18,7 @@ def xml_root(name):
 
     return root
 
+
 def xml_serialize(tree, key, value):
     if key:
         name = key[0].lower() + key[1:]
@@ -43,19 +43,21 @@ def xml_serialize(tree, key, value):
         for item in value:
             xml_serialize(node, 'item', item)
 
+
 def pretty_xml(tree):
     rough = ElementTree.tostring(tree, 'utf-8')
     parsed = minidom.parseString(rough)
     return parsed.toprettyxml(indent='    ')
 
+
 def parse_object(raw_data):
     out_data = {}
     for key, value in six.iteritems(raw_data):
         key_fix_splits = key.split("_")
-        l = len(key_fix_splits)
+        key_len = len(key_fix_splits)
 
         new_key = ""
-        for i in range(0, l):
+        for i in range(0, key_len):
             new_key += key_fix_splits[i][0].upper() + key_fix_splits[i][1:]
 
         data = out_data
@@ -70,6 +72,7 @@ def parse_object(raw_data):
     out_data = parse_lists(out_data)
     return out_data
 
+
 def parse_lists(data):
     for key, value in six.iteritems(data):
         if isinstance(value, dict):
@@ -87,6 +90,7 @@ def parse_lists(data):
                 data[key] = new_value
     return data
 
+
 class LaunchTemplates(BaseResponse):
     def create_launch_template(self):
         name = self._get_param('LaunchTemplateName')
@@ -126,8 +130,6 @@ class LaunchTemplates(BaseResponse):
             template = self.ec2_backend.get_launch_template_by_id(tmpl_id)
 
         version_description = self._get_param('VersionDescription')
-        tag_spec = self._get_param('TagSpecifications')
-        # source_version = self._get_int_param('SourceVersion')
 
         raw_template_data = self._get_dict_param('LaunchTemplateData.')
         template_data = parse_object(raw_template_data)
@@ -148,7 +150,6 @@ class LaunchTemplates(BaseResponse):
             })
             return pretty_xml(tree)
 
-
     # def delete_launch_template(self):
     #     pass
 
@@ -191,9 +192,12 @@ class LaunchTemplates(BaseResponse):
                 else:
                     vMax = min_version + max_results
 
-                ret_versions = template.versions[min_version-1:vMax-1]
+                vMin = min_version - 1
+                vMax = vMax - 1
+                ret_versions = template.versions[vMin:vMax]
             elif max_version:
-                ret_versions = template.versions[0:max_version-1]
+                vMax = max_version - 1
+                ret_versions = template.versions[:vMax]
             else:
                 ret_versions = template.versions