add a py.Println(self py.Object, args... string) function and implement it in OS module

Author: glaukiol1

main

@@ -5,7 +5,6 @@ package os
 // license that can be found in the LICENSE file.
 
 import (
-	"fmt"
 	"os"
 	"os/exec"
 	"reflect"
@@ -203,7 +202,11 @@ func system(self py.Object, args py.Tuple) (py.Object, error) {
 	if err != nil {
 		return nil, py.ExceptionNewf(py.OSError, err.Error())
 	}
-	fmt.Println(string(outb)) // FIXME - use gpython Stdout
+	code, err := py.Println(self, string(outb))
+	if code != 0 || err != nil {
+		return py.Int(1), nil
+	}
+
 	return py.Int(0), nil
 }
 

os/os.module.go

@@ -7,6 +7,7 @@ package py
 import (
 	"errors"
 	"strconv"
+	"strings"
 )
 
 var (
@@ -88,7 +89,7 @@ func LoadIntsFromList(list Object) ([]int64, error) {
 	if N <= 0 {
 		return nil, nil
 	}
-	
+
 	intList := make([]int64, N)
 	for i := Int(0); i < N; i++ {
 		item, err := getter.M__getitem__(i)
@@ -204,3 +205,35 @@ func loadValue(src Object, data interface{}) error {
 	}
 	return nil
 }
+
+// print to gpythons stdout neatly
+func Println(self Object, args ...string) (int, error) {
+	sysModule, err := self.(*Module).Context.GetModule("sys")
+	if err != nil {
+		return 1, err
+	}
+	stdout := sysModule.Globals["stdout"]
+	write, err := GetAttrString(stdout, "write")
+	if err != nil {
+		return 1, err
+	}
+	for _, v := range args {
+		if strings.Contains(v, "\n") {
+			_, err = Call(write, Tuple{String(v)}, nil) // do not write a space
+			if err != nil {
+				return 1, err
+			}
+		} else {
+			_, err = Call(write, Tuple{String(v + " ")}, nil)
+			if err != nil {
+				return 1, err
+			}
+		}
+
+	}
+	_, err = Call(write, Tuple{String("\n")}, nil) // newline
+	if err != nil {
+		return 1, err
+	}
+	return 0, nil
+}