[Python] replacement fixes (#3619)

* Python replacement fix

* Fix replacement for exn message

src/Fable.Transforms/Python/Fable2Python.fs

@@ -3082,14 +3082,6 @@ module Util =
         // printfn "transformGet: %A" (fableExpr.Type)
 
         match kind with
-        | Fable.FieldGet { Name = "message" } ->
-            let func = Expression.name "str"
-            let left, stmts = com.TransformAsExpr(ctx, fableExpr)
-            Expression.call (func, [ left ]), stmts
-        | Fable.FieldGet { Name = "push" } ->
-            let attr = Identifier("append")
-            let value, stmts = com.TransformAsExpr(ctx, fableExpr)
-            Expression.attribute (value = value, attr = attr, ctx = Load), stmts
         | Fable.ExprGet(TransformExpr com ctx (prop, stmts)) ->
             let expr, stmts' = com.TransformAsExpr(ctx, fableExpr)
             let expr, stmts'' = getExpr com ctx range expr prop

src/Fable.Transforms/Python/Replacements.fs

@@ -2829,7 +2829,7 @@ let resizeArrays
     | "set_Item", Some ar, [ idx; value ] -> setExpr r ar idx value |> Some
     | "Add", Some ar, [ arg ] ->
         "void ($0)"
-        |> emitExpr r t [ Helper.InstanceCall(ar, "push", t, [ arg ]) ]
+        |> emitExpr r t [ Helper.InstanceCall(ar, "append", t, [ arg ]) ]
         |> Some
     | "Remove", Some ar, [ arg ] ->
         let args =
@@ -4625,7 +4625,8 @@ let exceptions
     | ".ctor", _ ->
         Helper.ConstructorCall(makeIdentExpr "Exception", t, args, ?loc = r)
         |> Some
-    | "get_Message", Some e -> getFieldWith r t e "message" |> Some
+    | "get_Message", Some e ->
+        Helper.GlobalCall("str", t, [ thisArg.Value ], ?loc = r) |> Some
     | "get_StackTrace", Some e -> getFieldWith r t e "stack" |> Some
     | _ -> None
 

tests/Python/TestApplicative.fs

@@ -1174,7 +1174,7 @@ let ``test Curried function options work`` () =
 // See https://github.com/fable-compiler/Fable/issues/1199#issuecomment-347101093
 [<Fact>]
 let ``test Applying function options works`` () =
-    Pointful.testFunctionOptions
+    Pointful.testFunctionOptions ()
 
 [<Fact>]
 let ``test Point-free and partial application work`` () = // See #1199
@@ -1215,7 +1215,7 @@ let ``test Uncurried functions in record fields can be partially applied`` () =
 // See https://github.com/fable-compiler/Fable/issues/1199#issuecomment-347190893
 [<Fact>]
 let ``test Applicative operators work with three-argument functions``() =
-    Results.testOperatorsWith3Args
+    Results.testOperatorsWith3Args ()
 
 [<Fact>]
 let ``test partialApply works with tuples`` () =

tests/Python/TestMisc.fs

@@ -1329,7 +1329,7 @@ let ``test conditional expressions`` () = // See #2782
         | U2.Case2 s when s.t1 <> "" -> s.t1
         | _ -> ""
 
-    equal(test (U2.Case1 "x"), "x")
+    test (U2.Case1 "x") |> equal "x"
 
 type Æøå =
     | Union1 of string

tests/Python/TestPyInterop.fs

@@ -52,6 +52,7 @@ type Props =
 
 [<Global("Array")>]
 type PyArray =
+    [<Emit("$0.append($1)")>]
     abstract push: item: obj -> unit
     [<Emit("len($0)")>]
     abstract length: int

tests/Python/TestSeq.fs

@@ -54,7 +54,7 @@ let ``test Can test untyped enumerables`` () =
     sumEnumerable xs |> equal 3
     sumEnumerable ys |> equal 7
     sumEnumerable zs |> equal -1
-    
+
 [<Fact>]
 let ``test Seq.length works`` () =
     let xs = [1.; 2.; 3.; 4.]
@@ -216,7 +216,7 @@ let ``test Seq.find works`` () =
 [<Fact>]
 let ``test Seq.findIndex works`` () =
     let xs = [1.; 2.; 3.; 4.]
-    xs |> Seq.findIndex ((=) 2.)
+    xs |> Seq.findIndex ((=) 2.) |> equal 1
 
 [<Fact>]
 let ``test Seq.findBack works`` () =