diff --git a/nata/containers/core.py b/nata/containers/core.py
index 053d173..3d606ba 100644
--- a/nata/containers/core.py
+++ b/nata/containers/core.py
@@ -20,8 +20,7 @@ class BackendType(Protocol):
     name: str
 
     @staticmethod
-    def is_valid_backend(location: Path) -> bool:
-        ...  # pragma: no cover
+    def is_valid_backend(location: Path) -> bool: ...  # pragma: no cover
 
 
 class HasBackends:
diff --git a/nata/containers/grid.py b/nata/containers/grid.py
index 5cae239..37b654e 100644
--- a/nata/containers/grid.py
+++ b/nata/containers/grid.py
@@ -72,12 +72,10 @@ class GridBackend(Protocol):
     name: str
     location: Path
 
-    def __init__(self, location: FileLocation) -> None:
-        ...
+    def __init__(self, location: FileLocation) -> None: ...
 
     @staticmethod
-    def is_valid_backend(location: FileLocation) -> bool:
-        ...
+    def is_valid_backend(location: FileLocation) -> bool: ...
 
     dataset_name: str
     dataset_label: str
@@ -100,8 +98,7 @@ def is_valid_backend(location: FileLocation) -> bool:
 
 @runtime_checkable
 class GridDataReader(GridBackend, Protocol):
-    def get_data(self, indexing: Optional[BasicIndexing] = None) -> np.ndarray:
-        ...
+    def get_data(self, indexing: Optional[BasicIndexing] = None) -> np.ndarray: ...
 
 
 class GridArray(
diff --git a/nata/containers/particle.py b/nata/containers/particle.py
index 4ee4d10..5ef183e 100644
--- a/nata/containers/particle.py
+++ b/nata/containers/particle.py
@@ -83,12 +83,10 @@ class ParticleBackend(Protocol):
     name: str
     location: Path
 
-    def __init__(self, location: FileLocation) -> None:
-        ...
+    def __init__(self, location: FileLocation) -> None: ...
 
     @staticmethod
-    def is_valid_backend(location: FileLocation) -> bool:
-        ...
+    def is_valid_backend(location: FileLocation) -> bool: ...
 
     dataset_name: str
     dataset_label: str
@@ -111,8 +109,7 @@ class ParticleDataReader(ParticleBackend, Protocol):
     def get_data(
         self,
         indexing: Optional[BasicIndexing] = None,
-    ) -> np.ndarray:
-        ...
+    ) -> np.ndarray: ...
 
 
 class Quantity(
@@ -800,9 +797,7 @@ def _decay_to_ParticleDataset(
             time=self.time[index[0]],
         )
 
-    def __getitem__(
-        self, key: Any
-    ) -> Union[
+    def __getitem__(self, key: Any) -> Union[
         "ParticleDataset",
         "ParticleArray",
         "Particle",
diff --git a/nata/plots/figure.py b/nata/plots/figure.py
index 1b7802a..c976273 100644
--- a/nata/plots/figure.py
+++ b/nata/plots/figure.py
@@ -101,15 +101,17 @@ def scatter(
                 s=size,
                 c=color if has_colors else None,
                 color=color if has_single_color else None,
-                norm=mpl_norm_from_scale(
-                    colorscale,
-                    (
-                        colorrange[0] if colorrange else np.min(color),
-                        colorrange[1] if colorrange else np.max(color),
-                    ),
-                )
-                if has_colors
-                else None,
+                norm=(
+                    mpl_norm_from_scale(
+                        colorscale,
+                        (
+                            colorrange[0] if colorrange else np.min(color),
+                            colorrange[1] if colorrange else np.max(color),
+                        ),
+                    )
+                    if has_colors
+                    else None
+                ),
                 cmap=colormap,
                 alpha=alpha,
             )
diff --git a/nata/types.py b/nata/types.py
index 7e332d2..6ee140c 100644
--- a/nata/types.py
+++ b/nata/types.py
@@ -86,8 +86,7 @@ class BackendType(Protocol):
     #: point to data, either to open a file or to retrieve it.
     location: Optional[FileLocation]
 
-    def __init__(self, location: FileLocation) -> None:
-        ...
+    def __init__(self, location: FileLocation) -> None: ...
 
     @staticmethod
     def is_valid_backend(location: FileLocation) -> bool:
diff --git a/nata/utils/zdf.py b/nata/utils/zdf.py
index 3757690..b30ad6e 100644
--- a/nata/utils/zdf.py
+++ b/nata/utils/zdf.py
@@ -738,9 +738,9 @@ def read_track_data(self, trackInfo):
         for i in range(itermap.shape[0]):
             trackID = itermap[i, 0] - 1
             npoints = itermap[i, 1]
-            (trackData[trackID])[
-                trackNp[trackID] : trackNp[trackID] + npoints, :
-            ] = data[idx : idx + npoints, :]
+            (trackData[trackID])[trackNp[trackID] : trackNp[trackID] + npoints, :] = (
+                data[idx : idx + npoints, :]
+            )
             trackNp[trackID] += npoints
             idx += npoints
 
diff --git a/tests/containers/core_test.py b/tests/containers/core_test.py
index 5790a76..88ca319 100644
--- a/tests/containers/core_test.py
+++ b/tests/containers/core_test.py
@@ -23,11 +23,9 @@ class ExtendedProtocol(Protocol):
         some_other_prop: Tuple[int, ...]
 
         @staticmethod
-        def is_valid_backend(location: Path) -> bool:
-            ...
+        def is_valid_backend(location: Path) -> bool: ...
 
-        def some_other_method(self, foo: int) -> float:
-            ...
+        def some_other_method(self, foo: int) -> float: ...
 
     return ExtendedProtocol
 
diff --git a/tests/containers/grid_test.py b/tests/containers/grid_test.py
index 4d5bb3c..4f6e7fb 100644
--- a/tests/containers/grid_test.py
+++ b/tests/containers/grid_test.py
@@ -33,8 +33,7 @@ def __init__(self, location: Union[str, Path]) -> None:
             raise NotImplementedError
 
         @staticmethod
-        def is_valid_backend(location: Union[str, Path]) -> bool:
-            ...
+        def is_valid_backend(location: Union[str, Path]) -> bool: ...
 
         dataset_name = str()
         dataset_label = str()