func NewString(s string) (String, error) {
	var ps String
	cs := C.CString(s)
	ps.PyObject = C.PyString_FromString(cs)
	C.free(unsafe.Pointer(cs))
	if ps.PyObject == nil {
		return ps, errors.Wrap(GetError(), "error converting to Python string")
	}
	return ps, nil
}
String converts a Go string to a Python string.
package py
import "C"
import (
	"sync"
	"unsafe"
	"github.com/pkg/errors"
)
type String struct {
	Object
}