How can I change python version in Visual Studio Code?

There is a problem I can't solve. I already set up :

1.user setting

{
"atomKeymap.promptV3Features": true,
"editor.multiCursorModifier": "ctrlCmd",
"editor.formatOnPaste": true,
"python.pythonPath": "python3",
"command": "python3",

}

2.Workspace Settings

{
"python.pythonPath": "${workspaceFolder}/env/bin/python3.6",
"git.ignoreLimitWarning": true

}

3.tasks.jason file

{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "0.1.0",
"command": "python3",
"isShellCommand": true,
"args": ["${file}"],
"showOutput": "always"

}

If I use debug console and the version and path is right, debug

But my output always default "python2.7" no matter what I do. How can I improve it? output