diff --git a/pylast/__init__.py b/pylast/__init__.py
index 0b9755b..b2ffa37 100644
--- a/pylast/__init__.py
+++ b/pylast/__init__.py
@@ -30,6 +30,7 @@ import ssl
 import sys
 import tempfile
 import time
+import warnings
 import xml.dom
 
 from . import version
@@ -42,6 +43,14 @@ __license__ = "apache2"
 __email__ = "amr.hassan@gmail.com"
 __version__ = version.__version__
 
+if sys.version_info < (3,):
+    warnings.warn(
+        "You are using pylast with Python 2. "
+        "Pylast will soon be Python 3 only. "
+        "More info: https://github.com/pylast/pylast/issues/265",
+        UserWarning,
+    )
+
 if sys.version_info.major == 2:
     import htmlentitydefs
     from httplib import HTTPSConnection
@@ -1018,11 +1027,9 @@ class SessionKeyGenerator(object):
 
         token = self._get_web_auth_token()
 
-        url = "%(homepage)s/api/auth/?api_key=%(api)s&token=%(token)s" % {
-            "homepage": self.network.homepage,
-            "api": self.network.api_key,
-            "token": token,
-        }
+        url = "{homepage}/api/auth/?api_key={api}&token={token}".format(
+            homepage=self.network.homepage, api=self.network.api_key, token=token
+        )
 
         self.web_auth_tokens[url] = token