Update app.py

app.py

@@ -60,7 +60,7 @@ def generate_random_walk(iters, step_size = 1, random_seed=42):
     info_text = 'Start point=' + str(start_point) + '\n'  +'End point=' + str([x[-1],y[-1]]) + '\n' +'Displacement =' + str(distance_from_start([x[-1], y[-1]], start_point)) + '\n' +'Max x = ' + str(max(x)) + '\n' + 'Min x = ' + str(min(x)) + '\n' + 'Max y = ' + str(max(y)) + '\n' + 'Min y = ' + str(min(y)) 
     ax.legend([info_text], loc='best', handlelength=0, handletextpad=0, fancybox=True, fontsize=8)
     
-    plt.title('2D Random Walk\nsteps=' + str(iters)+', step size='+ str(step_size)+ ', seed = '+str(int(random_seed)))
+    plt.title( '2D Random Walk\nsteps=' + str(iters)+', step size='+ str(step_size)+ ', seed = '+str(int(random_seed)) )
     plt.grid()
     
     fig.canvas.draw()
@@ -74,7 +74,7 @@ try:
 except:
     random_seed = random.randint(1, 1000)
 
-if random_seed is None:
+if random_seed == None:
     random_seed = random.randint(1, 1000)
     
 iface = gr.Interface(fn=generate_random_walk, inputs=[iters, step_size, random_seed], outputs="image", title="2-D Random Walk Plot", description="Steps along NEWS directions only")