diff --git a/ckan/config/middleware/__init__.py b/ckan/config/middleware/__init__.py
index 433a9bc4505..92fc6e3d2a6 100644
--- a/ckan/config/middleware/__init__.py
+++ b/ckan/config/middleware/__init__.py
@@ -192,8 +192,8 @@ def __call__(self, environ, start_response):
         if app_name == 'flask_app':
             # This request will be served by Flask, but we still need the
             # Pylons URL builder (Routes) to work
-            parts = urlparse(config.get('ckan.site_url',
-                                                 'http://0.0.0.0:5000'))
+            parts = urlparse(
+                config.get('ckan.site_url', 'http://0.0.0.0:5000'))
             request_config = routes_request_config()
             request_config.host = str(parts.netloc + parts.path)
             request_config.protocol = str(parts.scheme)
diff --git a/ckan/lib/captcha.py b/ckan/lib/captcha.py
index 7a34d6ba212..aff2df033ac 100644
--- a/ckan/lib/captcha.py
+++ b/ckan/lib/captcha.py
@@ -13,7 +13,8 @@ def check_recaptcha(request):
         # Recaptcha not enabled
         return
 
-    client_ip_address = request.environ.get('REMOTE_ADDR', 'Unknown IP Address')
+    client_ip_address = request.environ.get(
+        'REMOTE_ADDR', 'Unknown IP Address')
 
     # reCAPTCHA v2
     recaptcha_response_field = request.form.get('g-recaptcha-response', '')
@@ -37,5 +38,6 @@ def check_recaptcha(request):
         # Something weird with recaptcha response
         raise CaptchaError()
 
+
 class CaptchaError(ValueError):
     pass
diff --git a/ckan/lib/search/__init__.py b/ckan/lib/search/__init__.py
index 2520410bcc4..09967501573 100644
--- a/ckan/lib/search/__init__.py
+++ b/ckan/lib/search/__init__.py
@@ -315,8 +315,10 @@ def check_solr_schema_version(schema_file=None):
 
     version = tree.documentElement.getAttribute('version')
     if not len(version):
-        raise SearchError('Could not extract version info from the SOLR'
-                          ' schema, using file: \n%s' % url)
+        msg = 'Could not extract version info from the SOLR schema'
+        if schema_file:
+            msg =+ ', using file {}'.format(schema_file)
+        raise SearchError(msg)
 
     if not version in SUPPORTED_SCHEMA_VERSIONS:
         raise SearchError('SOLR schema version not supported: %s. Supported'
diff --git a/ckanext/datapusher/logic/action.py b/ckanext/datapusher/logic/action.py
index 81545e67d4a..ce93fd24d28 100644
--- a/ckanext/datapusher/logic/action.py
+++ b/ckanext/datapusher/logic/action.py
@@ -65,7 +65,7 @@ def datapusher_submit(context, data_dict):
 
     callback_url_base = config.get('ckan.datapusher.callback_url_base')
     if callback_url_base:
-        callback_url = urlparse.urljoin(
+        callback_url = urljoin(
             callback_url_base.rstrip('/'), '/api/3/action/datapusher_hook')
     else:
         callback_url = h.url_for(
@@ -123,7 +123,7 @@ def datapusher_submit(context, data_dict):
 
     try:
         r = requests.post(
-            urlparse.urljoin(datapusher_url, 'job'),
+            urljoin(datapusher_url, 'job'),
             headers={
                 'Content-Type': 'application/json'
             },
@@ -289,7 +289,7 @@ def datapusher_status(context, data_dict):
     job_detail = None
 
     if job_id:
-        url = urlparse.urljoin(datapusher_url, 'job' + '/' + job_id)
+        url = urljoin(datapusher_url, 'job' + '/' + job_id)
         try:
             r = requests.get(url, headers={'Content-Type': 'application/json',
                                            'Authorization': job_key})