diff --git a/ast/expression.go b/ast/expression.go
index 180db0f..7a88c6c 100644
--- a/ast/expression.go
+++ b/ast/expression.go
@@ -1,6 +1,10 @@
 package ast
 
-import "fmt"
+import (
+	"fmt"
+
+	"github.com/brettlangdon/gython/gython"
+)
 
 type Expression interface {
 	Node
@@ -8,13 +12,13 @@ type Expression interface {
 }
 
 type Name struct {
-	Identifier string
+	Identifier *gython.Unicode
 	Context    ExpressionContext
 }
 
 func NewName(id string, ctx ExpressionContext) *Name {
 	return &Name{
-		Identifier: id,
+		Identifier: gython.NewUnicode([]byte(id)),
 		Context:    ctx,
 	}
 }
@@ -26,12 +30,12 @@ func (name *Name) String() string {
 }
 
 type Num struct {
-	Value int64
+	Value *gython.Float
 }
 
 func NewNum(i int64) *Num {
 	return &Num{
-		Value: i,
+		Value: gython.NewFloat(float64(i)),
 	}
 }
 
diff --git a/compiler/compiler.go b/compiler/compiler.go
index 94cd665..dfd48a9 100644
--- a/compiler/compiler.go
+++ b/compiler/compiler.go
@@ -45,25 +45,28 @@ func (compiler *Compiler) exitScope() *Scope {
 
 func (compiler *Compiler) assemble(addNone bool) *gython.CodeObject {
 	if addNone {
-		compiler.addOp(bytecode.LOAD_CONST)
-		compiler.addOp(bytecode.RETURN_VALUE)
+		// compiler.addOp(bytecode.LOAD_CONST)
+		// compiler.addOp(bytecode.RETURN_VALUE)
 	}
 
 	codeobject := gython.NewCodeObject([]byte{}, []byte{}, 0)
 	return codeobject
 }
 
-func (compiler *Compiler) addOp(op bytecode.Opcode) bool {
-	fmt.Println(bytecode.Opnames[op])
+func (compiler *Compiler) addOp(op bytecode.Opcode, value gython.Object) bool {
+	// TODO: add `value` object and get oparg
+	oparg := 0
+	instr := NewInstruction(op, oparg, true)
+	compiler.currentScope.AddInstruction(instr)
 	return true
 }
 
 func (compiler *Compiler) visitExpression(expr ast.Expression) bool {
 	switch expr := expr.(type) {
 	case *ast.Num:
-		compiler.addOp(bytecode.LOAD_CONST)
+		compiler.addOp(bytecode.LOAD_CONST, expr.Value)
 	case *ast.Name:
-		compiler.addOp(bytecode.STORE_NAME)
+		compiler.addOp(bytecode.STORE_NAME, expr.Identifier)
 	default:
 		fmt.Println(expr)
 	}
@@ -78,7 +81,7 @@ func (compiler *Compiler) visitStatement(stmt ast.Statement) bool {
 		length := len(stmt.Targets)
 		for i := 0; i < length; i++ {
 			if i < length-1 {
-				compiler.addOp(bytecode.DUP_TOP)
+				// compiler.addOp(bytecode.DUP_TOP)
 			}
 			compiler.visitExpression(stmt.Targets[i])
 		}
diff --git a/compiler/scope.go b/compiler/scope.go
index 13a2415..a6bd9c6 100644
--- a/compiler/scope.go
+++ b/compiler/scope.go
@@ -1,7 +1,15 @@
 package compiler
 
-type Scope struct{}
+type Scope struct {
+	Instructions []*Instruction
+}
 
 func NewScope() *Scope {
-	return &Scope{}
+	return &Scope{
+		Instructions: make([]*Instruction, 0),
+	}
+}
+
+func (scope *Scope) AddInstruction(instr *Instruction) {
+	scope.Instructions = append(scope.Instructions, instr)
 }
diff --git a/gython/codeobject.go b/gython/codeobject.go
index 07f0457..0319d6e 100644
--- a/gython/codeobject.go
+++ b/gython/codeobject.go
@@ -1,11 +1,11 @@
 package gython
 
 type CodeObject struct {
-	ArgCount            int64
-	KeywordOnlyArgCount int64
-	LocalsCount         int64
-	StackSize           int64
-	Flags               int64
+	ArgCount            int
+	KeywordOnlyArgCount int
+	LocalsCount         int
+	StackSize           int
+	Flags               int
 
 	Code              *Bytes
 	Constants         *Tuple
@@ -16,12 +16,30 @@ type CodeObject struct {
 
 	Filename        *Unicode
 	Name            *Unicode
-	FirstLineNumber int64
+	FirstLineNumber int
 	LineNumberTable *Bytes
 }
 
-func NewCodeObject(filename []byte, name []byte, firstLineNumber int64) *CodeObject {
-	return &CodeObject{}
+func NewCodeObject(filename []byte, name []byte, firstLineNumber int) *CodeObject {
+	return &CodeObject{
+		ArgCount:            0,
+		KeywordOnlyArgCount: 0,
+		LocalsCount:         0,
+		StackSize:           0,
+		Flags:               0,
+
+		Code:              NewBytes(),
+		Constants:         NewTuple(),
+		Names:             NewTuple(),
+		VariableNames:     NewTuple(),
+		FreeVariableNames: NewTuple(),
+		CellVariableNames: NewTuple(),
+
+		Filename:        NewUnicode(filename),
+		Name:            NewUnicode(name),
+		FirstLineNumber: firstLineNumber,
+		LineNumberTable: NewBytes(),
+	}
 }
 
 func (codeobject *CodeObject) object() {}
diff --git a/gython/float.go b/gython/float.go
index cffbdf7..7276f21 100644
--- a/gython/float.go
+++ b/gython/float.go
@@ -3,3 +3,11 @@ package gython
 type Float struct {
 	Value float64
 }
+
+func NewFloat(i float64) *Float {
+	return &Float{
+		Value: i,
+	}
+}
+
+func (float *Float) object() {}
diff --git a/gython/unicode.go b/gython/unicode.go
index 26a15fd..13bf487 100644
--- a/gython/unicode.go
+++ b/gython/unicode.go
@@ -1,10 +1,13 @@
 package gython
 
 type Unicode struct {
+	Value []byte
 }
 
 func (unicode *Unicode) object() {}
 
-func NewUnicode() *Unicode {
-	return &Unicode{}
+func NewUnicode(value []byte) *Unicode {
+	return &Unicode{
+		Value: value,
+	}
 }