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-rw-r--r--pkgs/development/interpreters/python/mk-python-derivation.nix4
-rw-r--r--pkgs/development/python-modules/pytest/default.nix3
2 files changed, 6 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index 63ffdbb8c0ac..ef8ee4e5425b 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -101,6 +101,10 @@ toPythonModule (python.stdenv.mkDerivation (builtins.removeAttrs attrs [
     ${python.interpreter} ${./catch_conflicts}/catch_conflicts.py
   '' + attrs.postFixup or '''';
 
+  # Print fewer warnings so we have less noise in our logs
+  # The amount of warnings also caused builds to be terminated.
+  PYTHONWARNINGS="once";
+
   meta = {
     # default to python's platforms
     platforms = python.meta.platforms;
diff --git a/pkgs/development/python-modules/pytest/default.nix b/pkgs/development/python-modules/pytest/default.nix
index 9412a750a9ab..ad8c8d9ad0da 100644
--- a/pkgs/development/python-modules/pytest/default.nix
+++ b/pkgs/development/python-modules/pytest/default.nix
@@ -24,7 +24,8 @@ buildPythonPackage rec {
 
   checkPhase = ''
     runHook preCheck
-    $out/bin/py.test -x testing/
+    # Re-enable warnings because the test suite relies on it.
+    PYTHONWARNINGS= $out/bin/py.test -x testing/
     runHook postCheck
   '';