Merge branch 'pr32' into python3

Author: tariqdaouda

pyArango/collection.py

@@ -149,7 +149,9 @@ def getCollectionClass(cls, name) :
         try :
             return cls.collectionClasses[name]
         except KeyError :
-            raise KeyError("There's no child of Collection by the name of: %s" % name)
+            raise KeyError("There is no Collection Class of type: '%s';"+
+                           " currently supported values: [%s]"
+                           % (name, ', '.join(getCollectionClasses().keys())))
 
     @classmethod
     def isCollection(cls, name) :

pyArango/connection.py

@@ -69,6 +69,8 @@ class Connection(object) :
     def __init__(self, arangoURL = 'http://localhost:8529', username=None, password=None) :
         self.databases = {}
         if arangoURL[-1] == "/" :
+            if ('url' not in vars()):
+                raise Exception("you either need to define `url` or make arangoURL contain an HTTP-Host")
             self.arangoURL = url[:-1]
         else :
             self.arangoURL = arangoURL
@@ -138,4 +140,4 @@ def __getitem__(self, dbName) :
             try :
                 return self.databases[dbName]
             except KeyError :
-                raise KeyError("Can't find any database named : %s" % dbName)
+                raise KeyError("Can't find any database named : %s" % dbName)