treewide: remove redundant numprocesses pytest-xdist parameter

Including the pytest-xdist package automatically configures numprocesses
to $NIX_BUILD_CORES, so specifying these on a package level has become
redundant.

pkgs/development/python-modules/alembic/default.nix

@@ -42,10 +42,6 @@ buildPythonPackage rec {
     pytest-xdist
   ];
 
-  pytestFlagsArray = [
-    "--numprocesses" "$NIX_BUILD_CORES"
-  ];
-
   meta = with lib; {
     homepage = "https://bitbucket.org/zzzeek/alembic";
     description = "A database migration tool for SQLAlchemy";

pkgs/development/python-modules/ansible-lint/default.nix

@@ -57,10 +57,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  pytestFlagsArray = [
-    "--numprocesses" "$NIX_BUILD_CORES"
-  ];
-
   preCheck = ''
     # ansible wants to write to $HOME and crashes if it can't
     export HOME=$(mktemp -d)

pkgs/development/python-modules/build/default.nix

@@ -52,8 +52,6 @@ buildPythonPackage rec {
   ];
 
   pytestFlagsArray = [
-    "-n"
-    "$NIX_BUILD_CORES"
     "-W"
     "ignore::DeprecationWarning"
   ];

pkgs/development/python-modules/cattrs/default.nix

@@ -52,9 +52,6 @@ buildPythonPackage rec {
     ujson
   ];
 
-  pytestFlagsArray = [
-    "--numprocesses $NIX_BUILD_CORES"
-  ];
 
   postPatch = ''
     substituteInPlace pyproject.toml \

pkgs/development/python-modules/clickhouse-driver/default.nix

@@ -57,8 +57,6 @@ buildPythonPackage rec {
   # some test in test_buffered_reader.py doesn't seem to return
   disabledTestPaths = [ "tests/test_buffered_reader.py" ];
 
-  pytestFlagsArray = [ "-n" "$NIX_BUILD_CORES" ];
-
   # most tests require `clickhouse`
   # TODO: enable tests after `clickhouse` unbroken
   doCheck = false;

pkgs/development/python-modules/dask/default.nix

@@ -67,8 +67,6 @@ buildPythonPackage rec {
   '';
 
   pytestFlagsArray = [
-    # parallelize
-    "--numprocesses $NIX_BUILD_CORES"
     # rerun failed tests up to three times
     "--reruns 3"
     # don't run tests that require network access

pkgs/development/python-modules/datashader/default.nix

@@ -70,7 +70,6 @@ buildPythonPackage rec {
   '';
 
   pytestFlagsArray = [
-    "-n $NIX_BUILD_CORES"
     "datashader"
   ];
 

pkgs/development/python-modules/debugpy/default.nix

@@ -84,7 +84,6 @@ buildPythonPackage rec {
   # Override default arguments in pytest.ini
   pytestFlagsArray = [
     "--timeout=0"
-    "-n=$NIX_BUILD_CORES"
   ];
 
   disabledTests = lib.optionals (pythonAtLeast "3.10") [

pkgs/development/python-modules/diskcache/default.nix

@@ -45,10 +45,6 @@ buildPythonPackage rec {
     "test_get_many"
   ];
 
-  pytestFlagsArray = [
-    "-n $NIX_BUILD_CORES"
-  ];
-
   pythonImportsCheck = [
     "diskcache"
   ];

pkgs/development/python-modules/dm-haiku/default.nix

@@ -38,7 +38,6 @@ buildPythonPackage rec {
     pytestCheckHook
     tensorflow
   ];
-  pytestFlagsArray = [ "-n $NIX_BUILD_CORES" ];
 
   pythonImportsCheck = [
     "haiku"

pkgs/development/python-modules/flax/default.nix

@@ -42,7 +42,6 @@ buildPythonPackage rec {
     pytestCheckHook
     tensorflow
   ];
-  pytestFlagsArray = [ "-n $NIX_BUILD_CORES" ];
 
   disabledTestPaths = [
     # Docs test, needs extra deps + we're not interested in it.

pkgs/development/python-modules/hypothesmith/default.nix

@@ -39,7 +39,6 @@ buildPythonPackage rec {
 
   pytestFlagsArray = [
     "-v"
-    "--numprocesses $NIX_BUILD_CORES"
   ];
 
   disabledTests = [

pkgs/development/python-modules/ibis-framework/default.nix

@@ -119,7 +119,6 @@ buildPythonPackage rec {
   ];
 
   pytestFlagsArray = [
-    "--numprocesses $NIX_BUILD_CORES"
     "ibis/tests"
     "ibis/backends/tests"
     "ibis/backends/{${lib.concatStringsSep "," backends}}/tests"

pkgs/development/python-modules/optax/default.nix

@@ -38,7 +38,6 @@ buildPythonPackage rec {
     tensorflow
     tensorflow-datasets
   ];
-  pytestFlagsArray = [ "-n $NIX_BUILD_CORES" ];
 
   pythonImportsCheck = [
     "optax"

pkgs/development/python-modules/pylint/default.nix

@@ -65,10 +65,6 @@ buildPythonPackage rec {
     export HOME=$TEMPDIR
   '';
 
-  pytestFlagsArray = [
-    "-n $NIX_BUILD_CORES"
-  ];
-
   disabledTestPaths = [
     # tests miss multiple input files
     # FileNotFoundError: [Errno 2] No such file or directory

pkgs/development/python-modules/scikit-learn/default.nix

@@ -78,8 +78,6 @@ buildPythonPackage rec {
     # https://github.com/scikit-learn/scikit-learn/issues/17582
     # Since we are overriding '-k' we need to include the 'disabledTests' from above manually.
     "-k" "'not (NuSVC and memmap) ${toString (lib.forEach disabledTests (t: "and not ${t}"))}'"
-
-    "-n" "$NIX_BUILD_CORES"
   ];
 
   preCheck = ''

pkgs/development/python-modules/tensorflow-datasets/default.nix

@@ -96,7 +96,6 @@ buildPythonPackage rec {
     tensorflow
     tifffile
   ];
-  pytestFlagsArray = [ "-n $NIX_BUILD_CORES" ];
 
   disabledTestPaths = [
     # Sandbox violations: network access, filesystem write attempts outside of build dir, ...

pkgs/development/python-modules/yamlfix/default.nix

@@ -37,11 +37,6 @@ buildPythonPackage rec {
       --replace 'python_paths = "."' ""
   '';
 
-  pytestFlagsArray = [
-    "-n"
-    "$NIX_BUILD_CORES"
-  ];
-
   pythonImportsCheck = [
     "yamlfix"
   ];

pkgs/tools/misc/pre-commit/default.nix

@@ -74,7 +74,6 @@ buildPythonPackage rec {
   '';
 
   pytestFlagsArray = [
-    "--numprocesses $NIX_BUILD_CORES"
     "--forked"
   ];
 

pkgs/tools/package-management/pdm/default.nix

@@ -71,7 +71,6 @@ buildPythonApplication rec {
   ];
 
   pytestFlagsArray = [
-    "--numprocesses $NIX_BUILD_CORES"
     "-m 'not network'"
   ];