Adding source code files for Chapter 10

Chapter10/webapps/app6.py

@@ -0,0 +1,36 @@
+#app6.py: error and exception handling
+import json
+from flask import Flask, render_template, abort
+from werkzeug.exceptions import HTTPException
+
+app = Flask(__name__)
+
+@app.get('/')
+def hello():
+    return 'Hello World!'
+
+@app.route('/greeting')
+def greeting():
+    x = 10/0
+    return 'Greetings from Flask web app!'
+
+@app.errorhandler(404)
+def page_not_found(error):
+    return render_template('error404.html'), 404
+
+@app.errorhandler(500)
+def internal_error(error):
+    return render_template('error500.html'), 500
+
+@app.errorhandler(HTTPException)
+def generic_handler(error):
+
+    error_detail = json.dumps({
+        "code": error.code,
+        "name": error.name,
+        "description": error.description,
+    })
+    return render_template('error.html', err_msg=error_detail), error.code
+
+if __name__ == '__main__':
+    app.run()