Can't preview in VSCode 1.36.1, python 3.7.3 / 3.7.4

[jingrongx]

Windows 10 1903
VSCode:

版本: 1.36.1 (user setup)
提交: 2213894ea0415ee8c85c5eea0d0ff81ecc191529
日期: 2019-07-08T22:59:35.033Z
Electron: 4.2.5
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Windows_NT x64 10.0.18362

Python:

(.env) PS D:\Documents\code\python> python
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

Ubuntu 19.04
VSCode:

版本: 1.36.1
提交: 2213894ea0415ee8c85c5eea0d0ff81ecc191529
日期: 2019-07-08T22:55:08.091Z
Electron: 4.2.5
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Linux x64 5.0.0-21-generic

Python:

(.env) xfree@xfree-virtual-machine:~/Documents/code/python$ python
Python 3.7.3 (default, Apr  3 2019, 05:39:12) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

[clawsl]

Try this approach and see if it works for you