How do i watch python source code files and restart when i save?
PythonNodemonPython Problem Overview
When I save a python source code file, I want to re-run the script. Is there a command that works like this (sort of like nodemon for node)?
Python Solutions
Solution 1 - Python
While there are probably ways to do this within the python ecosystem such as watchdog/watchmedo ( https://github.com/gorakhargosh/watchdog ), and maybe even linux scripting options with inotifywait ( https://linux.die.net/man/1/inotifywait ), for me, the easiest solution by far was... to just use nodemon! What I didn't know is that although the github tagline of nodemon is "Monitor for any changes in your node.js application and automatically restart the server - perfect for development" actually nodemon is a delicously generic tool and knows that .py files should be executed with python for example. Here's where I think the magic happens: https://github.com/remy/nodemon/blob/c1211876113732cbff78eb1ae10483eaaf77e5cf/lib/config/defaults.js
End result is that the command line below totally works. Yay!
$ nodemon hello.py
[nodemon] starting `python hello.py`
Solution 2 - Python
You can install nodemon to watch for file changes.
e.g.
npm i -g nodemon
Then to use:
nodemon --exec python3 hello.py
This is for when you use python3 in the command line. On windows you can also use 'py' instead.
Solution 3 - Python
The most similar way to nodemon I found is by using the watchdog package:
pip install watchdog
This comes with a utility called watchmedo:
watchmedo shell-command \
--patterns="*.py" \
--command='python "${watch_src_path}"' \
.
Now just work on your .py and it will be executed every time you save the file.
Solution 4 - Python
I just use npx nodemon pythonfile.py
and it works.Make sure you are using nodemon v2.0.x
or above
Solution 5 - Python
You actually can use nodemon with python, from their docs:
> Running non-node scripts nodemon can also be used to execute and
> monitor other programs. nodemon will read the file extension of the
> script being run and monitor that extension instead of .js if there's
> no nodemon.json:
>
> nodemon --exec "python -v" ./app.py
>
> Now nodemon will run app.py with python in verbose mode (note that if
> you're not passing args to the exec program, you don't need the
> quotes), and look for new or modified files with the .py extension.