Adopted new convention from template

src/Python/Problems001-050/Problem018.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 """
 Created on 15 Sep 2018
 
@@ -11,7 +11,7 @@ https://projecteuler.net/problem=18
 
 from utils import timeit
 
-triangle = [  # Mutable
+triangle = [
     [75],
     [95, 64],
     [17, 47, 82],
@@ -29,6 +29,7 @@ triangle = [  # Mutable
     [4, 62, 98, 27, 23, 9, 70, 98, 73, 93, 38, 53, 60, 4, 23],
 ]
 
+
 @timeit("Problem 18")
 def compute():
     """
@@ -52,5 +53,4 @@ def compute():
 
 
 if __name__ == "__main__":
-
-    print(f"Result for Problem 18: {compute()}")
+    print(f"Result for Problem 18 is {compute()}")