diff --git a/dev-lang/python/files/test-__all__-numpy.patch b/dev-lang/python/files/test-__all__-numpy.patch
new file mode 100644
index 0000000000000..1b91abbf6f60c
--- /dev/null
+++ b/dev-lang/python/files/test-__all__-numpy.patch
@@ -0,0 +1,13 @@
+diff --git a/Lib/test/test___all__.py b/Lib/test/test___all__.py
+index c077881511..0728bef6c4 100644
+--- a/Lib/test/test___all__.py
++++ b/Lib/test/test___all__.py
+@@ -71,6 +71,8 @@ class AllTest(unittest.TestCase):
+         blacklist = set([
+             # Will raise a SyntaxError when compiling the exec statement
+             '__future__',
++            # imports numpy which causes warnings
++            'test.test_pickletools',
+         ])
+ 
+         if not sys.platform.startswith('java'):
diff --git a/dev-lang/python/python-3.8.2-r1.ebuild b/dev-lang/python/python-3.8.2-r1.ebuild
index 35d4353459957..d6b9c2e9ec3ca 100644
--- a/dev-lang/python/python-3.8.2-r1.ebuild
+++ b/dev-lang/python/python-3.8.2-r1.ebuild
@@ -67,6 +67,8 @@ src_prepare() {
 	local PATCHES=(
 		"${WORKDIR}/${PATCHSET}"
 		"${FILESDIR}/test.support.unlink-ignore-PermissionError.patch"
+		# add module importing numpy to blacklist
+		"${FILESDIR}/test-__all__-numpy.patch"
 	)
 
 	default
diff --git a/dev-lang/python/python-3.9.0_alpha5.ebuild b/dev-lang/python/python-3.9.0_alpha5.ebuild
index 49d4c9d5f8777..2e9353ebaf6d3 100644
--- a/dev-lang/python/python-3.9.0_alpha5.ebuild
+++ b/dev-lang/python/python-3.9.0_alpha5.ebuild
@@ -83,6 +83,8 @@ src_prepare() {
 	local PATCHES=(
 		"${WORKDIR}/${PATCHSET}"
 		"${FILESDIR}/test.support.unlink-ignore-PermissionError.patch"
+		# add module importing numpy to blacklist
+		"${FILESDIR}/test-__all__-numpy.patch"
 	)
 
 	default