远程开发VsCode终端中运行PyQt5程序报错qt.qpa.xcb: could not connect to display，原因是vscode没有办法显示远程的图。

1.错误代码

qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

2. 原因

# 在VsCode的终端运行
$ env | grep DISPLAY
# 没有任何结果

3. 解决办法

打开有x服务器的远程shell工具，比如mobaxterm，Xshell等
连接远程主机（vscode连接的主机）
输入

env | grep DISPLAY # 在系统终端上查看DISPLAY

DISPLAY=localhost:10.0

回到vscode，在终端输入

export DISPLAY=localhost:10.0

解决，vscode成功运行代码并显示
但是
此方法必须保持shell工具打开，且下一次打开工程还要打开shell共工具并在vscode输入
export DISPLAY=localhost:10.0
​

建议直接在shell跑带显示的代码