diff --git a/pympipool/shell/executor.py b/pympipool/shell/executor.py
index 5b72d1ed..d9eda6fa 100644
--- a/pympipool/shell/executor.py
+++ b/pympipool/shell/executor.py
@@ -41,6 +41,7 @@ class SubprocessSingleExecutor(ExecutorBase):
     """
     The pympipool.shell.SubprocessSingleExecutor is the internal worker for the pympipool.shell.SubprocessExecutor.
     """
+
     def __init__(self):
         super().__init__()
         self._process = RaisingThread(
@@ -77,6 +78,7 @@ class SubprocessExecutor(ExecutorBase):
         (False, "test", True)
 
     """
+
     def __init__(
         self,
         max_workers=1,
diff --git a/pympipool/shell/interactive.py b/pympipool/shell/interactive.py
index f990c8e3..b155577b 100644
--- a/pympipool/shell/interactive.py
+++ b/pympipool/shell/interactive.py
@@ -104,6 +104,7 @@ class ShellExecutor(ExecutorBase):
         >>>     print(future_pattern.done(), future_pattern.result(), future_pattern.done())
         (False, "0\n1\n2\n3\ndone\n", True)
     """
+
     def __init__(self, *args, **kwargs):
         super().__init__()
         self._process = RaisingThread(