diff --git a/lazy_loader/__init__.py b/lazy_loader/__init__.py
index 743fd91..28ed5b1 100644
--- a/lazy_loader/__init__.py
+++ b/lazy_loader/__init__.py
@@ -6,9 +6,9 @@
 """
 import importlib
 import importlib.util
-import types
 import os
 import sys
+import types
 
 
 def attach(package_name, submodules=None, submod_attrs=None):
@@ -66,19 +66,17 @@ def attach(package_name, submodules=None, submod_attrs=None):
 
     def __getattr__(name):
         if name in submodules:
-            return importlib.import_module(f'{package_name}.{name}')
+            return importlib.import_module(f"{package_name}.{name}")
         elif name in attr_to_modules:
-            submod = importlib.import_module(
-                f'{package_name}.{attr_to_modules[name]}'
-            )
+            submod = importlib.import_module(f"{package_name}.{attr_to_modules[name]}")
             return getattr(submod, name)
         else:
-            raise AttributeError(f'No {package_name} attribute {name}')
+            raise AttributeError(f"No {package_name} attribute {name}")
 
     def __dir__():
         return __all__
 
-    if os.environ.get('EAGER_IMPORT', ''):
+    if os.environ.get("EAGER_IMPORT", ""):
         for attr in set(attr_to_modules.keys()) | submodules:
             __getattr__(attr)
 
@@ -171,6 +169,4 @@ def __getattribute__(self, attr):
         if attr in ["__class__"]:
             return super().__getattribute__("__class__")
 
-        raise ModuleNotFoundError(
-            f"No module named '{spec.name}'"
-        )
+        raise ModuleNotFoundError(f"No module named '{spec.name}'")
diff --git a/tests/test_lazy_loader.py b/tests/test_lazy_loader.py
index 06a50ba..f74009f 100644
--- a/tests/test_lazy_loader.py
+++ b/tests/test_lazy_loader.py
@@ -1,6 +1,6 @@
 import sys
-import importlib
 import types
+
 import pytest
 
 import lazy_loader as lazy
@@ -31,20 +31,20 @@ def test_lazy_import_impact_on_sys_modules():
     math = lazy.load("math")
     anything_not_real = lazy.load("anything_not_real")
 
-    assert type(math) == types.ModuleType
+    assert isinstance(math, types.ModuleType)
     assert "math" in sys.modules
-    assert type(anything_not_real) == lazy.DelayedImportErrorModule
+    assert isinstance(anything_not_real, lazy.DelayedImportErrorModule)
     assert "anything_not_real" not in sys.modules
 
     # only do this if numpy is installed
-    np_test = pytest.importorskip("numpy")
+    pytest.importorskip("numpy")
     np = lazy.load("numpy")
-    assert type(np) == types.ModuleType
+    assert isinstance(np, types.ModuleType)
     assert "numpy" in sys.modules
 
     np.pi  # trigger load of numpy
 
-    assert type(np) == types.ModuleType
+    assert isinstance(np, types.ModuleType)
     assert "numpy" in sys.modules