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

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

tests/test_digraph.py

@@ -1,4 +1,5 @@
 """Test the 'znflow.DiGraph' class."""
+
 import znflow
 
 

tests/test_external_node.py

@@ -2,6 +2,7 @@
 
 These nodes are not run but only used as a source of data.
 """
+
 import dataclasses
 
 import znflow

tests/test_utils.py

@@ -1,4 +1,5 @@
 """Test the 'znflow.utils' module."""
+
 import pytest
 
 from znflow import utils

tests/test_znflow.py

@@ -1,4 +1,5 @@
 """Test the 'znflow' package."""
+
 import znflow
 
 

znflow/__init__.py

@@ -1,4 +1,5 @@
 """The 'ZnFlow' package."""
+
 import contextlib
 import importlib.metadata
 import logging

znflow/utils.py

@@ -1,4 +1,5 @@
 """Utils of the 'ZnFlow' package."""
+
 import abc
 import functools
 

znflow/visualize.py

@@ -1,4 +1,5 @@
 """The 'ZnFlow' visualization module."""
+
 import math
 
 import networkx as nx