diff --git a/maths/tanh.py b/maths/tanh.py
index 70306c5ee..93ef6ec46 100644
--- a/maths/tanh.py
+++ b/maths/tanh.py
@@ -33,5 +33,5 @@ def tanh_func(vector):
     return (2 / (1 + exp_vector)) - 1
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     print(tanh_func(np.array([0.23])))