I was having a look at python-flask framework some days ago. In my Ubuntu 18.04 terminal was showing a error as below when I was running flask run-
oserror: [errno 98] address already in use flask
I was trying heart and soul to solve this. Finally got a solution-
1. Paste following code in terminal
ps -fA | grep python
You will get a pid number by naming of your flask number. Now copy the pid number from second column of your project row of terminal output.
2. Then write as below-
kill -9 pid
The terminal will restart and then the command-
Will work fine!
Thank you.. :)