diff --git a/Ausgleichsbecken/Ausgleichsbecken_class_file.py b/Ausgleichsbecken/Ausgleichsbecken_class_file.py
index 69652dc..568be71 100644
--- a/Ausgleichsbecken/Ausgleichsbecken_class_file.py
+++ b/Ausgleichsbecken/Ausgleichsbecken_class_file.py
@@ -1,14 +1,16 @@
+import os
+import sys
 from logging import exception
+
 import numpy as np
 
 #importing pressure conversion function
-import sys
-import os
 current = os.path.dirname(os.path.realpath(__file__))
 parent = os.path.dirname(current)
 sys.path.append(parent)
 from functions.pressure_conversion import pressure_conversion
 
+
 def FODE_function(x_out,h,A,A_a,p,rho,g):
     # (FODE     ... first order differential equation)
     # based on the outflux formula by Andreas Malcherek
diff --git a/Druckrohrleitung/Druckrohrleitung_class_file.py b/Druckrohrleitung/Druckrohrleitung_class_file.py
index 4ca2021..093ad9d 100644
--- a/Druckrohrleitung/Druckrohrleitung_class_file.py
+++ b/Druckrohrleitung/Druckrohrleitung_class_file.py
@@ -1,13 +1,15 @@
+import os
+import sys
+
 import numpy as np
 
 #importing pressure conversion function
-import sys
-import os
 current = os.path.dirname(os.path.realpath(__file__))
 parent = os.path.dirname(current)
 sys.path.append(parent)
 from functions.pressure_conversion import pressure_conversion
 
+
 class Druckrohrleitung_class:
 # units 
     # make sure that units and display units are the same
diff --git a/Turbinen/Turbinen_class_file.py b/Turbinen/Turbinen_class_file.py
index de4db09..b39a01e 100644
--- a/Turbinen/Turbinen_class_file.py
+++ b/Turbinen/Turbinen_class_file.py
@@ -1,15 +1,16 @@
+import os
+import sys
+
 import numpy as np
+from pyparsing import alphanums
 
 #importing pressure conversion function
-import sys
-import os
-
-from pyparsing import alphanums
 current = os.path.dirname(os.path.realpath(__file__))
 parent = os.path.dirname(current)
 sys.path.append(parent)
 from functions.pressure_conversion import pressure_conversion
 
+
 class Francis_Turbine:
 # units 
     # make sure that units and display units are the same