Change some practice

practice/9.local-development/app/app.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+import os
+
+from flask import Flask
+from flask import request
+
+config = {
+        "port": os.environ.get('PORT', 8000),
+        "debug": os.environ.get('DEBUG', False)
+}
+
+app = Flask(__name__)
+
+@app.route("/")
+def hello():
+    return "Hello, Updated!"
+
+@app.route("/api/sum")
+def sum():
+    a = request.args.get('a')
+    b = request.args.get('b')
+    return "{0}+{1}={2}".format(a, b, int(a)+int(b))
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=config["port"], debug=config["debug"])