[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

tests/test_deepmd_mixed.py

@@ -522,20 +522,10 @@ def setUp(self):
                 os.path.exists(os.path.join(i, "real_atom_types.npy")), True
             )
 
-        
-        self.system_names = [
-            "C1H4A0B0",
-            "C1H3A0B0",
-            "C1H1A1B2"
-        ]
-        self.system_sizes = {
-            "C1H4A0B0": 1,
-            "C1H3A0B0": 1,
-            "C1H1A1B2": 1
-        }
+        self.system_names = ["C1H4A0B0", "C1H3A0B0", "C1H1A1B2"]
+        self.system_sizes = {"C1H4A0B0": 1, "C1H3A0B0": 1, "C1H1A1B2": 1}
         self.atom_names = ["C", "H", "A", "B"]
 
-
     def tearDown(self):
         if os.path.exists("tmp.deepmd.fparam.aparam"):
             shutil.rmtree("tmp.deepmd.fparam.aparam")