Add linespacing according to PEP8

Author: IshaanDesai

elastic-tube-1d/fluid-python/FluidSolver.py

@@ -10,7 +10,8 @@
 import matplotlib.animation as manimation
 from output import writeOutputToVTK
 import precice
-from precice import action_write_initial_data, action_write_iteration_checkpoint, action_read_iteration_checkpoint
+from precice import action_write_initial_data, action_write_iteration_checkpoint, \
+    action_read_iteration_checkpoint
 
 # physical properties of the tube
 r0 = 1 / np.sqrt(np.pi)  # radius of the tube
@@ -27,6 +28,7 @@
 dx = L / kappa
 # helper function to create constant cross section
 
+
 def velocity_in(t): return u0 + ampl * np.sin(frequency *
                                               (t + t_shift) * np.pi)  # inflow velocity
 

elastic-tube-1d/solid-python/SolidSolver.py

@@ -5,7 +5,8 @@
 import argparse
 import numpy as np
 import precice
-from precice import action_write_initial_data, action_read_iteration_checkpoint, action_write_iteration_checkpoint
+from precice import action_write_initial_data, action_read_iteration_checkpoint, \
+    action_write_iteration_checkpoint
 
 
 r0 = 1 / np.sqrt(np.pi)  # radius of the tube
@@ -17,6 +18,7 @@
 E = 10000  # elasticity module
 c_mk = np.sqrt(E / 2 / r0)  # wave speed
 
+
 def crossSection0(N):
     return a0 * np.ones(N + 1)