Personally,
I am -1 on the name - I think '-X importtrace' or similar would be
better I think.
I am +100 on the functionality - Unless you put in log messages,
tracking imports is complex - so something like this I can see being
very useful.
I know I don't make the decisions, but it seems if this really is only a
couple of lines, and all the test cases pass this (or something very
similar) should be a considered for 3.12.
Thank you Noah,
------ Original Message ------
From: "Noah Kim" <noahb...@gmail.com>
To: python-ideas@python.org
Sent: Saturday, 11 Feb, 23 At 00:07
Subject: [Python-ideas] Proposal: -X importcache to supplement -X
importtime for loaded modules
All,
I'm writing to propose an adjacent interpreter flag to `-X importtime`:
`-X importcache` (open to alternative naming).
While `-X importtime` is incredibly useful for analyzing module import
times, by design, it doesn't log anything if an imported module has
already been loaded. `-X importcache` would provide additional output
for every module that's already been loaded:
```
import uuid
import time: cached | cached | _io
import time: cached | cached | _io
import time: cached | cached | os
import time: cached | cached | sys
import time: cached | cached | enum
import time: cached | cached | _io
import time: cached | cached | _io
import time: cached | cached | collections
import time: cached | cached | os
import time: cached | cached | re
import time: cached | cached | sys
import time: cached | cached | functools
import time: cached | cached | itertools
import time: 151 | 151 | _wmi
import time: 18290 | 18440 | platform
import time: 372 | 372 | _uuid
import time: 10955 | 29766 | uuid
```
In codebases with convoluted/poorly managed import graphs (and
consequently, workloads that suffer from long import times), the ability
to record all paths to an expensive dependency--not just the
first-imported--can help expedite refactoring (and help scale
identification of this type of issue). More generally, this flag would
provide a more efficient path to tracking runtime dependencies.
As a proof of concept, I was able to hack this functionality into `-X
importtime` by adding a couple lines to `import_ensure_initialized` in
`Python/import.c` (hence the output above). A separate flag is probably
desirable to preserve backwards compatibility.
Looking forward to your feedback,
Noah
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