Support partial function inspection in data migrations

tests/functional/test_data_migrations.py

@@ -104,6 +104,15 @@ class DataMigrationDetectionTestCase(unittest.TestCase):
         self.assertEqual(0, self.linter.nb_erroneous)
         self.assertFalse(self.linter.has_errors)
 
+    def test_partial_function(self):
+        reverse_migration = self.linter.migration_loader.disk_migrations[
+            ("app_data_migrations", "0004_partial_function")
+        ]
+        self.linter.lint_migration(reverse_migration)
+
+        self.assertEqual(1, self.linter.nb_warnings)
+        self.assertFalse(self.linter.has_errors)
+
 
 class DataMigrationModelImportTestCase(unittest.TestCase):
     def test_missing_get_model_import(self):

tests/test_project/app_data_migrations/migrations/0004_partial_function.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.2 on 2020-01-27 17:47
+
+from __future__ import annotations
+
+import functools
+
+from django.db import migrations
+
+
+def backward_op(c, david, test):
+    pass
+
+
+def forward_op(const, arg1, arg2):
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [("app_data_migrations", "0003_incorrect_arguments")]
+
+    operations = [
+        migrations.RunPython(
+            functools.partial(forward_op, "constant"),
+            functools.partial(backward_op, "constant"),
+        )
+    ]