hello world flask

code/frontend.py

+from flask import Flask
+import os
+
+app = Flask(__name__)
+
+@app.route("/")
+def hello_world():
+    return "<p>Hello, World!</p>"
+
+if __name__ == "__main__":
+    app.run()
\ No newline at end of file

code/test.py

+print("hello")
\ No newline at end of file