test_flask.py works with python3, also added cleaner fstrings

[LEvinson2504]

I made a few changes so it works with python3, also used fstrings because the look cleaner.

[drandreaskrueger]

Thanks a lot, that's much appreciated. Do you want to adapt the whole repo like this?

Yes, I got your code running with py3:

deactivate
python3 -m venv env3
source env3/bin/activate
pip install -U pip && pip install bottle cherrypy Flask tornado web.py psutil requests
python3 test_flask.py 

well done.

[drandreaskrueger]

but now the same code fails on py27

deactivate
virtualenv env2; source env2/bin/activate; python --version
source env2/bin/activate
pip install -U pip && pip install bottle cherrypy Flask tornado web.py psutil requests
python2 test_flask.py

I'd prefer re-writing it in a way that would work in py27 AND in python3x.
Identical code also has the advantage that comparing the performance of the py27 and py3x libraries is more straightforward.

I understand your aesthetics argument - but could you live without that here? :-)

[drandreaskrueger]

I understand your aesthetics argument - but could you live without that here? :-)

Or rather: Yes, improve the aesthetics please (since I wrote it back then, my experience has increased too, so I get your point), but in a way that keeps it working in both py27 and py3x.

Thanks.