PAPaulHoule·Nov 30, 2022Submission
Change Python Code While Running Without Losing State
1 points · Open discussionjulvo
reloading
Python2019–2022
julvo / reloading
reloading
Change Python code while it's running without losing state
3Distinct people
6Mentions
0Explicit recommenders
1.1KGitHub stars
What to know before exploring
What it is
Change Python code while it's running without losing state
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year6 dated mentions
Observed mentions: 2019-10-16 08:46:17 UTC to 2022-11-30 19:04:17 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 3 | 1 | 2 |
What Hacker News says
6 sourcesI'm about to embark on my master's thesis, in a domain[1] which could realllllly use the "attach to running process; re-evaluate code and have the system just keep going" aspect of Lisp languages.
I know Python best. But I have reached my breaking point with its syntax, and its lack of binding constructs, and lack of symbol datatype, quote, etc. I am intending to use Clojure ... but I have to ship this thing by May 2023 come hell or high water.
All else being equal, I will proooobably be able to go further with Python. But I'm concerned it will hamstring me from doing the crucial feature of "extending the design [ie code] of a game as it runs" since, AFAIK, it's difficult to get a Lisp-ish experience of total live reloadability in Python... jurigged[2] and reloading[3] not withstanding.
I know some common lisp so I'm not a total lisp noob
Read the rest
. I've learned enough CLJ to be dangerous ... but I'm worried I'm backing myself into an endless hole by using a language I'm not yet master of. Yet, I think the features of the ecosystem (total live reloadability of a CLJ/CLJS app! with current state preserved even down to what a user has typed in the HTML UI!) are so tempting...
Just venting out loud. comment/contact if you have suggestios or are curious about the project; i'm soon to begin blogging as I develop it.
[1] I'm reinventing the "virtual tabletop." Current ones are so fucking shallow.
[2] https://github.com/breuleux/jurigged
[3] https://github.com/julvo/reloading
To add to the list of very handy footguns:
@reloading to hot-reload a function from source before every invocation (https://github.com/julvo/reloading)
In Useful Python decorators for data scientistsWrote a similar thing [1]. It can also load loop bodies from source before each iteration. Can be helpful for long running loops like when downloading or training deep learning models.
[1] https://github.com/julvo/reloading
In Reloadr – Hot code reloading tool for PythonHave a look at https://github.com/julvo/reloading, it's a little library I wrote that can give you edit-code-and-continue-debugging in Python loops. A more general solution for this sort of development in Python would be neat though.
In Hot-swapping Python 3 codeShow HN: Change Python code while it's running using a reloading loop
187 points · Open discussion