diff --git a/test_flask.py b/test_flask.py
index fec8f6f..7cf0c5f 100644
--- a/test_flask.py
+++ b/test_flask.py
@@ -1,7 +1,7 @@
 '''
 
            test_flask.py
-    
+
 @summary:  Comparing (RAM usage) of different webframeworks
 @since:    4 Mar 2016
 @author:   Andreas
@@ -9,40 +9,48 @@
 @license:  MIT but please donate:
 @bitcoin:  14EyWS5z8Y5kgwq52D3qeZVor1rUsdNYJy
 
-@thanks:   to Kevin Veroneau. I based parts of this on his code snippets. 
+@thanks:   to Kevin Veroneau. I based parts of this on his code snippets.
            http://www.pythondiary.com/blog/Feb.14,2012/too-many-micro-webframeworks.html
-           
+
 '''
 
-from flask import Flask, __version__ # pip install Flask
 
-HOST, PORT= '127.0.0.1', 5000
+from flask import Flask, __version__  # pip install Flask
+
+HOST, PORT = '127.0.0.1', 5000
 
 app = Flask(__name__)
 
+
 @app.route('/hello/<name>')
 def hello(name="Earth"):
-    return "Hello %s!" % name
+    return f"Hello {name}!"
+
 
 def run_flask_simplest():
     app.run()
-    
+
+
 def run_server(host=HOST, port=PORT):
-    print "Flask", 
-    from time import sleep; sleep(0.1) # only because of stdout / stderr printing
+    print("Flask"),
+    from time import sleep
+    sleep(0.1)  # only because of stdout / stderr printing
     app.run(host=host, port=port)
-    
+
+
 def url(host=HOST, port=PORT):
-    return "http://%s:%s/hello/World" % (host, port)
+    return f"http://{host}:{port}/hello/World"
+
 
 def version():
     return ("flask", __version__)
-    
+
+
 if __name__ == '__main__':
     # run_flask_simplest()
-    
-    from sys import argv as a; port=int(a[1]) if len(a)>1 else PORT # get port from commandline argument
-    
+
+    from sys import argv as a
+    # get port from commandline argument
+    port = int(a[1]) if len(a) > 1 else PORT
+
     run_server(port=port)
-    
-    
\ No newline at end of file