#23406: Migrations not found when only .pyc files are available (e.g. in a
frozen
environment)
-------------------------------------+-------------------------------------
Reporter: Daniel Menzel | Owner: Dan
| Watson
Type: Bug | Status: assigned
Component: Migrations | Version: 1.7
Severity: Normal | Resolution:
Keywords: migrations, .pyc, | Triage Stage: Accepted
frozen, cx_Freeze |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Dan Watson):
It's true that by default, pyc files are compiled into `__pycache__`
directories, but there are explicit affordances made to import pyc files
that exist **in place of** the original py file. See
https://www.python.org/dev/peps/pep-3147/#case-4-legacy-pyc-files-and-
source-less-imports
This is the case for frozen or sourceless distributions. There are
switches in `compileall` to output legacy pyc files for this purpose (and
in fact this is what the unit test does). Whether frozen or sourceless
distributions are a good idea is a much more subjective and (seemingly)
controversial issue, but they are still possible, and this is how.
This setting is pretty narrow in scope, just to allow frozen distributions
(and is off by default with a warning in the docs about the problems it
may cause).
--
Ticket URL: <https://code.djangoproject.com/ticket/23406#comment:23>
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