diff --git a/perpendicular-flap/solid-fenics/solid.py b/perpendicular-flap/solid-fenics/solid.py
index 6f3707e32..7b34cbeec 100644
--- a/perpendicular-flap/solid-fenics/solid.py
+++ b/perpendicular-flap/solid-fenics/solid.py
@@ -95,12 +95,13 @@ def neumann_boundary(x, on_boundary):
     Chung, J., and Hulbert, G. M. (June 1, 1993). "A Time Integration Algorithm for Structural Dynamics With Improved Numerical Dissipation:
     The Generalized-α Method." ASME. J. Appl. Mech. June 1993; 60(2): 371–375. https://doi.org/10.1115/1.2900803
 """
-assert(alpha_m <= alpha_f)
-assert(alpha_f <= 0.5)
+assert (alpha_m <= alpha_f)
+assert (alpha_f <= 0.5)
 
 gamma = Constant(0.5 + alpha_f - alpha_m)
 beta = Constant((gamma + 0.5)**2 / 4.)
 
+
 # Define strain
 def epsilon(u):
     return 0.5 * (nabla_grad(u) + nabla_grad(u).T)