Updates for the third release.

Author: Bill Lubanovic

README.md

@@ -2,6 +2,7 @@ Introducing Python
 =================
 
 This repository contains the programs featured in _Introducing Python_.
+Some examples have been updated for the second and third printings.
 
 |directory|chapter|
 |---|---|

intro/archive.py

@@ -0,0 +1,19 @@
+import webbrowser
+import json
+from urllib.request import urlopen
+
+print("Let's find an old website.")
+site = input("Type a website URL: ")
+era = input("Type a year, month, and day, like 20150613: ")
+url = "http://archive.org/wayback/available?url=%s&timestamp=%s" % (site, era)
+response = urlopen(url)
+contents = response.read()
+text = contents.decode("utf-8")
+data = json.loads(text)
+try :
+    old_site = data["archived_snapshots"]["closest"]["url"]
+    print("Found this copy: ", old_site)
+    print("It should appear in your browser now.")
+    webbrowser.open(old_site)
+except :
+    print("Sorry, no luck finding", site)

intro/archive2.py

@@ -0,0 +1,16 @@
+import webbrowser
+import requests
+
+print("Let's find an old website.")
+site = input("Type a website URL: ")
+era = input("Type a year, month, and day, like 20150613: ")
+url = "http://archive.org/wayback/available?url=%s&timestamp=%s" % (site, era)
+response = requests.get(url)
+data = response.json()
+try :
+    old_site = data["archived_snapshots"]["closest"]["url"]
+    print("Found this copy: ", old_site)
+    print("It should appear in your browser now.")
+    webbrowser.open(old_site)
+except :
+    print("Sorry, no luck finding", site)