diff --git a/demo.py b/demo.py
new file mode 100644
index 0000000..aea75a2
--- /dev/null
+++ b/demo.py
@@ -0,0 +1,47 @@
+import plyproto.parser as plyproto
+
+test1 = """package tutorial;"""
+
+test2 = """package tutorial;
+
+message Person {
+  required string name = 1;
+  required int32 id = 2;
+  optional string email = 3;
+}
+
+"""
+
+test3 = """package tutorial;
+option java_outer_classname = "PushNotifications";
+option optimize_for = "SPEED";
+
+  message Person {
+      required string name = 1;
+      required int32 id = 2;
+      optional string email = 3;
+
+      enum PhoneType {
+        MOBILE = 0;
+        HOME = 1;
+        WORK = 2;
+      }
+
+      message PhoneNumber {
+        required string number = 1;
+        optional PhoneType type = 2 [default = HOME];
+      }
+
+      repeated PhoneNumber phone = 4;
+      extensions 500 to 990;
+}
+
+message AddressBook {
+  repeated Person person = 1;
+
+  // Possible extension numbers.
+  extensions 500 to max;
+}"""
+
+parser = plyproto.ProtobufAnalyzer()
+print(parser.parse_string(test3))