Modernize it.

main.py

@@ -18,33 +18,56 @@ GNU General Public License for more details.
 A copy of the GNU General Public License version 2 is in license.txt.
 """
 
+import apt
 import sys
+import argparse
 import launchpadlib
 from launchpadlib.launchpad import Launchpad
 
+parser = argparse.ArgumentParser()
+parser.add_argument("-f", "--file", help="The path of the input file", required=True)
+parser.add_argument("-u", "--lp-user", help="The Launchpad ID of the team you would like to subscribe the bugs to", required=True)
+parser.add_argument("-r", "--remove", action="store_true", help="Instead of subscribing to the packages, unsubscribe")
+args = parser.parse_args()
+
 def no_credential():
-    print("Can't proceed without Launchpad credentials.")
-    sys.exit()
+    raise ValueError("Can't proceed without Launchpad credentials.")
 
-lp = Launchpad.login_with('Mass package bug subscription adder', 'production', credential_save_failed=no_credential)
-teamtowrite = (input('What person/team would you like to use for this? (Launchpad ID) '))
+lp = Launchpad.login_with("masspackagelp", "production", credential_save_failed=no_credential)
 
-while True:
+def main():
+    while True:
+        try:
+            with open(args.file, "r") as ins:
+                filelines = []
+                for line in ins:
+                    filelines.append(line.strip())
+            break
+        except FileNotFoundError:
+            raise FileNotFoundError("File not found.")
+
+    if not args.remove:
+        for i in range(len(filelines)):
+            try:
+                lp.distributions["ubuntu"].getSourcePackage(name=filelines[i]).addBugSubscription(subscriber=lp.people[args.lp_user])
+                print("Successfully added subscription for " + filelines[i])
+            except AttributeError:
+                print("Source package " + filelines[i] + " not found")
+    else:
+        for i in range(len(filelines)):
+            print("Removing subscription for: " + filelines[i])
+            try:
+                lp.distributions["ubuntu"].getSourcePackage(name=filelines[i]).removeBugSubscription(subscriber=lp.people[args.lp_user])
+                print("Successfully removed subscription for " + filelines[i])
+            except AttributeError:
+                print("Source package not found.")
+            except:
+                print(args.lp_user + " is not subscribed to " + filelines[i] + " so not removing")
+
+
+if __name__ == '__main__':
     try:
-        filepath = (input('Please specify the path of the input file: '))
-        with open(filepath, "r") as ins:
-            filearray = []
-            for line in ins:
-                filearray.append(line.strip())
-        break
-    except FileNotFoundError:
-        print("File not found.")
-
-for i in range(len(filearray)):
-    print("Assigning:")
-    print(filearray[i])
-    try:
-        lp.distributions['ubuntu'].getSourcePackage(name=filearray[i]).addBugSubscription(subscriber=lp.people[teamtowrite])
-    except AttributeError:
-        print("Source package not found.")
-    print("Complete")
+        main()
+    except KeyboardInterrupt:
+        print("Exiting...")
+        exit()