diff --git a/documentation-samples/quickstarts/knowledgebase_quickstart/knowledgebase_quickstart.py b/documentation-samples/quickstarts/knowledgebase_quickstart/knowledgebase_quickstart.py
index 5841e3e..de39f2c 100644
--- a/documentation-samples/quickstarts/knowledgebase_quickstart/knowledgebase_quickstart.py
+++ b/documentation-samples/quickstarts/knowledgebase_quickstart/knowledgebase_quickstart.py
@@ -16,12 +16,12 @@
 
 # <resourcekeys>
 key_var_name = 'QNAMAKER_KEY'
-if not key_var_name in os.environ:
+if key_var_name not in os.environ:
 	raise Exception('Please set/export the environment variable: {}'.format(key_var_name))
 subscription_key = os.environ[key_var_name]
 
 host_var_name = 'QNAMAKER_HOST'
-if not host_var_name in os.environ:
+if host_var_name not in os.environ:
 	raise Exception('Please set/export the environment variable: {}'.format(host_var_name))
 host = os.environ[host_var_name]
 # </resourcekeys>