Some Python and General Helpful Linux Development Tricks:

Some Python and General Helpful Linux Development Tricks:

Redirect stderr and stdout to two different files and view the output seperately:

First stdout on its own:

If you run your python app then do the following:

virtenv) $ python3 try.py > out.txt

Then in another terminal do the following while that is running:

(Make sure to run in same directory:)

$  tail -f out.txt

Stderr on its own:

virtenv) $ python3 try.py 2> error-out.txt

Then in another terminal do the following while that is running:

(Make sure to run in same directory:)

$  tail -f out.txt

Now you can combine the two like this:

virtenv) $ python3 try.py  > out.txt 2> error-out.txt

Then in another window run:

$ tail -f error-out.txt

And in another window run:

$ tail -f out.txt

If you read this and you are not familiar with screen or tmux, then you will be thinking, how do I do this in the same terminal?
You should have a look at screen or tmux, they are used to open multiple terminal sessions in one window and to switch between them.
You can read more about them here:

Tmux:

• http://jilles.me/tmux-for-developers/

Screen:

• https://www.tecmint.com/screen-command-examples-to-manage-linux-terminals/