diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1fd5a6555..83e9f8934 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -95,13 +95,12 @@ mypy:
   stage: python
   script:
     - cd $DAMASKROOT/python
-    - mypy damask/mechanics.py
+    - mypy damask/tensor.py damask/mechanics.py
   except:
     - master
     - release
 
 
-
 ###################################################################################################
 compile_grid_Intel:
   stage: compile
diff --git a/python/damask/mechanics.py b/python/damask/mechanics.py
index 0e160523b..1a03f390b 100644
--- a/python/damask/mechanics.py
+++ b/python/damask/mechanics.py
@@ -5,13 +5,15 @@ All routines operate on numpy.ndarrays of shape (...,3,3).
 
 """
 
-from . import tensor as _tensor
-from . import _rotation
+from typing import Sequence
 
 import numpy as _np
 
+from . import tensor as _tensor
+from . import _rotation
 
-def deformation_Cauchy_Green_left(F):
+
+def deformation_Cauchy_Green_left(F: _np.ndarray) -> _np.ndarray:
     """
     Calculate left Cauchy-Green deformation tensor (Finger deformation tensor).
 
@@ -29,7 +31,7 @@ def deformation_Cauchy_Green_left(F):
     return _np.matmul(F,_tensor.transpose(F))
 
 
-def deformation_Cauchy_Green_right(F):
+def deformation_Cauchy_Green_right(F: _np.ndarray) -> _np.ndarray:
     """
     Calculate right Cauchy-Green deformation tensor.
 
@@ -47,7 +49,7 @@ def deformation_Cauchy_Green_right(F):
     return _np.matmul(_tensor.transpose(F),F)
 
 
-def equivalent_strain_Mises(epsilon):
+def equivalent_strain_Mises(epsilon: _np.ndarray) -> _np.ndarray:
     """
     Calculate the Mises equivalent of a strain tensor.
 
@@ -65,7 +67,7 @@ def equivalent_strain_Mises(epsilon):
     return _equivalent_Mises(epsilon,2.0/3.0)
 
 
-def equivalent_stress_Mises(sigma):
+def equivalent_stress_Mises(sigma: _np.ndarray) -> _np.ndarray:
     """
     Calculate the Mises equivalent of a stress tensor.
 
@@ -83,7 +85,7 @@ def equivalent_stress_Mises(sigma):
     return _equivalent_Mises(sigma,3.0/2.0)
 
 
-def maximum_shear(T_sym):
+def maximum_shear(T_sym: _np.ndarray) -> _np.ndarray:
     """
     Calculate the maximum shear component of a symmetric tensor.
 
@@ -102,7 +104,7 @@ def maximum_shear(T_sym):
     return (w[...,0] - w[...,2])*0.5
 
 
-def rotation(T):
+def rotation(T: _np.ndarray) -> _rotation.Rotation:
     """
     Calculate the rotational part of a tensor.
 
@@ -120,7 +122,7 @@ def rotation(T):
     return _rotation.Rotation.from_matrix(_polar_decomposition(T,'R')[0])
 
 
-def strain(F,t,m):
+def strain(F: _np.ndarray, t: str, m: float) -> _np.ndarray:
     """
     Calculate strain tensor (Seth–Hill family).
 
@@ -160,7 +162,7 @@ def strain(F,t,m):
     return eps
 
 
-def stress_Cauchy(P,F):
+def stress_Cauchy(P: _np.ndarray, F: _np.ndarray) -> _np.ndarray:
     """
     Calculate the Cauchy stress (true stress).
 
@@ -182,7 +184,7 @@ def stress_Cauchy(P,F):
     return _tensor.symmetric(_np.einsum('...,...ij,...kj',1.0/_np.linalg.det(F),P,F))
 
 
-def stress_second_Piola_Kirchhoff(P,F):
+def stress_second_Piola_Kirchhoff(P: _np.ndarray, F: _np.ndarray) -> _np.ndarray:
     """
     Calculate the second Piola-Kirchhoff stress.
 
@@ -205,7 +207,7 @@ def stress_second_Piola_Kirchhoff(P,F):
     return _tensor.symmetric(_np.einsum('...ij,...jk',_np.linalg.inv(F),P))
 
 
-def stretch_left(T):
+def stretch_left(T: _np.ndarray) -> _np.ndarray:
     """
     Calculate left stretch of a tensor.
 
@@ -223,7 +225,7 @@ def stretch_left(T):
     return _polar_decomposition(T,'V')[0]
 
 
-def stretch_right(T):
+def stretch_right(T: _np.ndarray) -> _np.ndarray:
     """
     Calculate right stretch of a tensor.
 
@@ -241,7 +243,7 @@ def stretch_right(T):
     return _polar_decomposition(T,'U')[0]
 
 
-def _polar_decomposition(T,requested):
+def _polar_decomposition(T: _np.ndarray, requested: Sequence[str]) -> tuple:
     """
     Perform singular value decomposition.
 
@@ -257,21 +259,21 @@ def _polar_decomposition(T,requested):
     u, _, vh = _np.linalg.svd(T)
     R = _np.einsum('...ij,...jk',u,vh)
 
-    output = ()
+    output = []
     if 'R' in requested:
-        output+=(R,)
+        output+=[R]
     if 'V' in requested:
-        output+=(_np.einsum('...ij,...kj',T,R),)
+        output+=[_np.einsum('...ij,...kj',T,R)]
     if 'U' in requested:
-        output+=(_np.einsum('...ji,...jk',R,T),)
+        output+=[_np.einsum('...ji,...jk',R,T)]
 
     if len(output) == 0:
         raise ValueError('output needs to be out of V, R, U')
 
-    return output
+    return tuple(output)
 
 
-def _equivalent_Mises(T_sym,s):
+def _equivalent_Mises(T_sym: _np.ndarray, s: float) -> _np.ndarray:
     """
     Base equation for Mises equivalent of a stress or strain tensor.
 
diff --git a/python/mypy.ini b/python/mypy.ini
new file mode 100644
index 000000000..e6900781c
--- /dev/null
+++ b/python/mypy.ini
@@ -0,0 +1,16 @@
+[mypy-scipy.*]
+ignore_missing_imports = True
+[mypy-h5py.*]
+ignore_missing_imports = True
+[mypy-vtk.*]
+ignore_missing_imports = True
+[mypy-PIL.*]
+ignore_missing_imports = True
+[mypy-matplotlib.*]
+ignore_missing_imports = True
+[mypy-yaml.*]
+ignore_missing_imports = True
+[mypy-pandas.*]
+ignore_missing_imports = True
+[mypy-wx.*]
+ignore_missing_imports = True