branch core-updates updated: build-system/python: Set PYTHONDONTWRITEBYTECODE.

[guix-commits]

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apteryx pushed a commit to branch core-updates
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The following commit(s) were added to refs/heads/core-updates by this push:
     new cf495c9  build-system/python: Set PYTHONDONTWRITEBYTECODE.
cf495c9 is described below

commit cf495c934e3cc9c642edb8ddb783db64618682a5
Author: Maxim Cournoyer <maxim.cournoyer@gmail.com>
AuthorDate: Fri Nov 20 01:00:25 2020 -0500

    build-system/python: Set PYTHONDONTWRITEBYTECODE.
    
    * guix/build/python-build-system.scm (enable-bytecode-determinism): Set
    PYTHONDONTWRITEBYTECODE.
---
 guix/build/python-build-system.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/guix/build/python-build-system.scm 
b/guix/build/python-build-system.scm
index 4a07496..1179315 100644
--- a/guix/build/python-build-system.scm
+++ b/guix/build/python-build-system.scm
@@ -260,6 +260,9 @@ installed with setuptools."
   "Improve determinism of pyc files."
   ;; Use deterministic hashes for strings, bytes, and datetime objects.
   (setenv "PYTHONHASHSEED" "0")
+  ;; Prevent Python from creating .pyc files when loading modules (such as
+  ;; when running a test suite).
+  (setenv "PYTHONDONTWRITEBYTECODE" "1")
   #t)
 
 (define %standard-phases