diff --git a/python/damask/lattice.py b/python/damask/lattice.py
index fe3965547..1887bae7c 100644
--- a/python/damask/lattice.py
+++ b/python/damask/lattice.py
@@ -1,7 +1,6 @@
 import numpy as np
 
 from .rotation import Rotation
-from . import Lambert
 
 P = -1
 
diff --git a/python/damask/rotation.py b/python/damask/rotation.py
index 08ec7c564..084e4bf38 100644
--- a/python/damask/rotation.py
+++ b/python/damask/rotation.py
@@ -219,8 +219,7 @@ class Rotation:
     def asRodrigues(self,
                     vector = False):
         """
-        Rodrigues-Frank vector representation [n_1, n_2, n_3, tan(ω/2)] unless vector == True:
-        [n_1, n_2, n_3] * tan(ω/2).
+        Rodrigues-Frank vector representation [n_1, n_2, n_3, tan(ω/2)] unless vector == True: [n_1, n_2, n_3] * tan(ω/2).
 
         Parameters
         ----------
@@ -634,7 +633,7 @@ class Rotation:
     @staticmethod
     def eu2ro(eu):
         """Bunge-Euler angles to Rodriques-Frank vector."""
-        ro = eu2ax(eu)                                                                              # convert to axis angle pair representation
+        ro = Rotation.eu2ax(eu)                                                                     # convert to axis angle pair representation
         if ro[3] >= np.pi:                                                                          # Differs from original implementation. check convention 5
             ro[3] = np.inf
         elif iszero(ro[3]):
@@ -754,7 +753,7 @@ class Rotation:
     @staticmethod
     def ro2cu(ro):
         """Rodriques-Frank vector to cubochoric vector."""
-        return ho2cu(ro2ho(ro))
+        return Rotation.ho2cu(Rotation.ro2ho(ro))
 
 
     #---------- Homochoric vector----------
diff --git a/python/damask/util.py b/python/damask/util.py
index 3d17ddd06..553ae0c6e 100644
--- a/python/damask/util.py
+++ b/python/damask/util.py
@@ -39,7 +39,7 @@ class bcolors:
     
 
 def srepr(arg,glue = '\n'):
-    """
+    r"""
     Join arguments as individual lines.
     
     Parameters
@@ -110,7 +110,6 @@ def execute(cmd,
             env = None):
     """
     Execute command.
-    
 
     Parameters
     ----------
@@ -179,6 +178,7 @@ def progressBar(iteration, total, prefix='', bar_length=50):
       Prefix string.
     bar_length : int, optional
       Character length of bar. Defaults to 50.
+
     """
     fraction = iteration / float(total)
     if not hasattr(progressBar, "last_fraction"):                                                   # first call to function
diff --git a/python/tests/test_Rotation.py b/python/tests/test_Rotation.py
index dd9e20363..c545a7172 100644
--- a/python/tests/test_Rotation.py
+++ b/python/tests/test_Rotation.py
@@ -1,10 +1,8 @@
 import os
-from itertools import permutations
 
 import pytest
 import numpy as np
 
-import damask
 from damask import Rotation
    
 n = 1000