Misc changes (#732)

Author: slozier

Src/IronPython/Runtime/Operations/StringOps.cs

@@ -2023,10 +2023,10 @@ private static PythonList SplitInternal(string self, string separator, int maxsp
 
         private static void TryStringOrTuple(object prefix) {
             if (prefix == null) {
-                throw PythonOps.TypeError("expected string or Tuple, got NoneType");
+                throw PythonOps.TypeError("expected string or tuple, got NoneType");
             }
             if (!(prefix is string) && !(prefix is PythonTuple) && !(prefix is Extensible<string>)) {
-                throw PythonOps.TypeError("expected string or Tuple, got {0} Type", prefix.GetType());
+                throw PythonOps.TypeError("expected string or tuple, got {0}", DynamicHelpers.GetPythonType(prefix).Name);
             }
         }
 

Src/IronPython/Runtime/PythonFunction.cs

@@ -523,21 +523,15 @@ public object cell_contents {
 
         #region ICodeFormattable Members
 
-        public string/*!*/ __repr__(CodeContext/*!*/ context) {
-            return String.Format("<cell at {0}: {1}>",
-                IdDispenser.GetId(this),
-                GetContentsRepr()
-                );
-        }
+        public string/*!*/ __repr__(CodeContext/*!*/ context)
+            => $"<cell at 0x{IdDispenser.GetId(this):X}: {GetContentsRepr()}>";
 
         private string GetContentsRepr() {
             if (Value == Uninitialized.Instance) {
                 return "empty";
             }
 
-            return String.Format("{0} object at {1}",
-                PythonTypeOps.GetName(Value),
-                IdDispenser.GetId(Value));
+            return $"{PythonTypeOps.GetName(Value)} object at 0x{IdDispenser.GetId(Value):X}";
         }
 
         #endregion

Src/IronPythonTest/Cases/AllCPythonCasesManifest.ini

@@ -978,10 +978,6 @@ Ignore=true
 [AllCPython.test_unicodedata]
 Ignore=true
 
-[AllCPython.test_univnewlines]
-Ignore=true
-Reason=TypeError: FileIO() takes at most 3 arguments (4 given)
-
 [AllCPython.test_urllib]
 Ignore=true
 Reason=StackOverflowException - https://github.com/IronLanguages/ironpython2/issues/182