[uwsgi]
socket = 127.0.0.1:3031
chdir = /home/foobar/myproject/
wsgi-file = myproject/wsgi.py
processes = 4
threads = 2
stats = 127.0.0.1:9191

above is the content of official document .
if you compare your uwsgi.ini configuration file, there are two differences.
the first obvious error

chidir = /home/ubuntu/project/test -sharp  chdir chidir
wsgi-file = /home/ubuntu/project/test/test.py -sharp 

should be changed to

chdir = /home/ubuntu/project/test -sharp  chdir chidir
wsgi-file = test.py -sharp 

the second place is

socket = 127.0.0.1:8080

to

stats = 127.0.0.1:8080

I modified it like this, first of all, I modified the configuration file of nginx.
as for the reason for this change, it is not clear, that is, I read other people's posts and then tried to modify them, at least verifying that they can be used

server {
    listen 80;
    server_name 111.230.140.182;
    charset utf-8;
    client_max_body_size 75M;
    location / {
        include uwsgi_params;
        uwsgi_pass 127.0.0.1:8080;
        -sharpuwsgi_param UWSGI_PYTHON /usr/bin/python;  //
        -sharpuwsgi_param UWSGI_CHDIR /home/ubuntu/project/test;  //
        -sharpuwsgi_param UWSGI_SCRIPT test:app ;  //
    }
}

then change the configuration file of uwsgi to:

[uwsgi]
socket=127.0.0.1:8080
plugins = python
wsgi-file=test.py
master=true
processes=4
threads=2
callable=app
stats=127.0.0.1:9191

look at the modification from above, remove the chdir, and then add the master=true, to retain the socket while adding a stats.
after running nginx and uwsgi, you can enter the ip address in the browser and jump directly to the hello world interface.

to talk about the pain in the balls, the configuration file above is new.ini tapped by my own hand. I had the same content on the previous uwsgi.ini file, but I reported an error and couldn't find app. I have found that this uwsgi file is copy directly from the Internet. There are a lot of spaces in front of the line "callable=app". You can't see it. There may be special characters or something. Delete the space and OK it.
this is a pit, so you'd better knock it yourself from now on.