Add some examples

examples/list/main.go

@@ -0,0 +1,63 @@
+/*
+Unless explicitly stated otherwise all files in this repository are licensed
+under the $license_for_repo License.
+This product includes software developed at Datadog (https://www.datadoghq.com/).
+Copyright 2018 Datadog, Inc.
+*/
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/DataDog/go-python3"
+)
+
+func main() {
+	python3.Py_Initialize()
+
+	if !python3.Py_IsInitialized() {
+		fmt.Println("Error initializing the python interpreter")
+		os.Exit(1)
+	}
+
+	err := printList()
+	if err != nil {
+		fmt.Printf("failed to print the python list: %s\n", err)
+	}
+
+	python3.Py_Finalize()
+}
+
+func printList() error {
+	list := python3.PyList_New(5)
+
+	if exc := python3.PyErr_Occurred(); list == nil && exc != nil {
+		return fmt.Errorf("Fail to create python list object")
+	}
+	defer list.DecRef()
+
+	repr, err := pythonRepr(list)
+	if err != nil {
+		return fmt.Errorf("fail to get representation of object list")
+	}
+	fmt.Printf("python list: %s\n", repr)
+
+	return nil
+}
+
+func pythonRepr(o *python3.PyObject) (string, error) {
+	if o == nil {
+		return "", fmt.Errorf("object is nil")
+	}
+
+	s := o.Repr()
+	if s == nil {
+		python3.PyErr_Clear()
+		return "", fmt.Errorf("failed to call Repr object method")
+	}
+	defer s.DecRef()
+
+	return python3.PyUnicode_AsUTF8(s), nil
+}

examples/python3/main.go

@@ -0,0 +1,31 @@
+/*
+Unless explicitly stated otherwise all files in this repository are licensed
+under the $license_for_repo License.
+This product includes software developed at Datadog (https://www.datadoghq.com/).
+Copyright 2018 Datadog, Inc.
+*/
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/DataDog/go-python3"
+)
+
+func main() {
+	i, err := python3.Py_Main(os.Args)
+	if err != nil {
+		fmt.Printf("error launching the python interpreter: %s\n", err)
+		os.Exit(1)
+	}
+	if i == 1 {
+		fmt.Println("The interpreter exited due to an exception")
+		os.Exit(1)
+	}
+	if i == 2 {
+		fmt.Println("The parameter list does not represent a valid Python command line")
+		os.Exit(1)
+	}
+}