py: Allow keyword arguments for namedtuple

tests/basics/namedtuple1.py

@@ -6,19 +6,19 @@ except ImportError:
 T = namedtuple("Tup", ["foo", "bar"])
 # CPython prints fully qualified name, what we don't bother to do so far
 #print(T)
-t = T(1, 2)
-print(t)
-print(t[0], t[1])
-print(t.foo, t.bar)
+for t in T(1, 2), T(bar=1, foo=2):
+    print(t)
+    print(t[0], t[1])
+    print(t.foo, t.bar)
 
-print(len(t))
-print(bool(t))
-print(t + t)
-print(t * 3)
+    print(len(t))
+    print(bool(t))
+    print(t + t)
+    print(t * 3)
 
-print([f for f in t])
+    print([f for f in t])
 
-print(isinstance(t, tuple))
+    print(isinstance(t, tuple))
 
 try:
     t[0] = 200
@@ -39,6 +39,16 @@ try:
 except TypeError:
     print("TypeError")
 
+try:
+    t = T(foo=1)
+except TypeError:
+    print("TypeError")
+
+try:
+    t = T(1, foo=1)
+except TypeError:
+    print("TypeError")
+
 # Try single string
 # Not implemented so far
 #T3 = namedtuple("TupComma", "foo bar")