Adding source code files for Chapter 10

Chapter10/webapps/app3.py

@@ -0,0 +1,17 @@
+#app3.py: rendering static and dynamic contents
+from flask import Flask, render_template, url_for, redirect
+
+app = Flask(__name__)
+
+@app.route('/hello')
+def hello():
+    hello_url = url_for ('static', filename='app3.html')
+    return redirect(hello_url)
+
+@app.route('/greeting')
+def greeting():
+    msg = "Hello from Python"
+    return render_template('app3.html', greeting=msg)
+
+if __name__ == '__main__':
+    app.run()