feat(builtins): NotImplemented

Author: litlighilit

Objects/notimplementedobject.nim

@@ -0,0 +1,18 @@
+import ./pyobject
+import ./stringobject
+
+declarePyType NotImplemented(tpToken):
+  discard
+
+let pyNotImplemented* = newPyNotImplementedSimple()  ## singleton
+
+proc isNotImplemented*(obj: PyObject): bool =
+  obj.id == pyNotImplemented.id
+
+proc dollar(self: PyNotImplementedObject): string = "NotImplemented"
+method `$`*(self: PyNotImplementedObject): string =
+  self.dollar
+
+implNotImplementedMagic repr:
+  newPyString self.dollar
+

Objects/pyobjectBase.nim

@@ -10,6 +10,7 @@ type
     NULL,
     Object,
     None,
+    NotImplemented,
     BaseError, # exception
     Int,
     Float,

Python/bltinmodule.nim

@@ -2,7 +2,7 @@ import strformat
 {.used.}  # this module contains toplevel code, so never `importButNotUsed`
 import neval
 import builtindict
-import ../Objects/[bundle, typeobject, methodobject, descrobject, funcobject]
+import ../Objects/[bundle, typeobject, methodobject, descrobject, funcobject, notimplementedobject]
 import ../Utils/[utils, macroutils, compat]
 
 
@@ -106,6 +106,7 @@ implBltinFunc buildClass(funcObj: PyFunctionObject, name: PyStrObject), "__build
   tpMagic(Type, new)(@[pyTypeObjectType, name, newPyTuple(@[]), f.toPyDict()])
 
 
+registerBltinObject("NotImplemented", pyNotImplemented)
 registerBltinObject("None", pyNone)
 registerBltinObject("type", pyTypeObjectType)
 registerBltinObject("range", pyRangeObjectType)