Watchmedo is a command that is part of the watchdog package.
I plan on using it for local Django/celery development. As I read about in Auto-reload celery on code changes, watchmedo supports an auto-restart argument. With this, it takes control of a long-running subprocess and restarts it on matched file system events. Have a look at watchmedo auto-restart --help for more details.
If you see a message like this during one of your heroku builds/pushes, here’s what you should do:
remote: -----> Python app detected
remote: ! Python has released a security update! Please consider upgrading to python-3.7.7
Take a look at what your runtime.txt file looks like. Mine looks like:
$ more runtime.txt
python-3.7.6
So, fire up your favorite editor and make it match.
Then commit that file, and push it back up to your repo and heroku.
$ git push heroku master
Counting objects: 3, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 300 bytes | 12.00 KiB/s, done.
Total 3 (delta 1), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Python app detected
remote: -----> Found python-3.7.6, removing
remote: -----> No change in requirements detected, installing from cache
remote: -----> Installing python-3.7.7
remote: -----> Installing pip
remote: -----> Installing dependencies with Pipenv 2018.5.18…
remote: Installing dependencies from Pipfile.lock (a33c91)…It’s pretty simple to have your python script jump out to the debugger. Place these 2 lines right before where you want to start monitoring (otherwise, you’ll need to do a lot of stepping thru code).
import pdb
pdb.set_trace()Some useful ones to remember are:
b: set a breakpointc: continue debugging until you hit a breakpoints: step through the coden: to go to next line of codel: list source code for the current file (default: 11 lines including the line being executed)u: navigate up a stack framed: navigate down a stack framep: to print the value of an expression in the current context