Add basic collections.namedtuple implementation.

tests/basics/namedtuple1.py

@@ -0,0 +1,40 @@
+from collections import namedtuple
+
+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.foo, t.bar)
+
+print(isinstance(t, tuple))
+
+try:
+    t[0] = 200
+except TypeError:
+    print("TypeError")
+try:
+    t.bar = 200
+except AttributeError:
+    print("AttribiteError")
+
+try:
+    t = T(1)
+except TypeError:
+    print("TypeError")
+
+try:
+    t = T(1, 2, 3)
+except TypeError:
+    print("TypeError")
+
+# Try comma field separator
+T2 = namedtuple("TupComma", "foo,bar")
+t = T2(1, 2)
+print(t)
+print(t.foo, t.bar)
+
+# Try list of fields
+# Not implemented so far
+#T3 = namedtuple("TupComma", ["foo", "bar"])
+#t = T3(1, 2)