Adopted new convention from template

src/Python/Problem060.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 """
 Created on 04 Dic 2021
 
@@ -9,7 +9,31 @@ Solution for problem 60 of Project Euler
 https://projecteuler.net/problem=60
 """
 
-from utils import timeit, list_primes, is_prime
+from utils import is_prime, list_primes, timeit
+
+
+def solve_backtrack(max_chain_length, chain):
+    primes_list = list_primes(10_000)
+
+    for p in primes_list[1:]:
+        if p not in chain and is_concatenable(chain, p):
+            chain.append(p)
+            if len(chain) == max_chain_length:
+                return chain
+            solve_backtrack(max_chain_length, chain)
+            chain.pop()
+
+    return chain
+
+
+def is_concatenable(chain, candidate):
+    for n in chain:
+        if not is_prime(int(str(n) + str(candidate))):
+            return False
+        if not is_prime(int(str(candidate) + str(n))):
+            return False
+
+    return True
 
 
 @timeit("Problem 60")
@@ -25,30 +49,9 @@ def compute():
     concatenate to produce another prime.
     """
 
-    primes_list = list_primes(10_000)
-
-    def solve_backtrack(max_chain_length, chain):
-        for p in primes_list[1:]:
-            if p not in chain and is_concatenable(chain, p):
-                chain.append(p)
-                if len(chain) == max_chain_length:
-                    return chain
-                solve_backtrack(max_chain_length, chain)
-                chain.pop()
-        return chain
-
-    def is_concatenable(chain, candidate):
-        for n in chain:
-            if not is_prime(int(str(n) + str(candidate))):
-                return False
-            if not is_prime(int(str(candidate) + str(n))):
-                return False
-        return True
-
-    result = solve_backtrack(5, [])
-    return sum(result)
+    ans = solve_backtrack(5, [])
+    return sum(ans)
 
 
 if __name__ == "__main__":
-
-    print(f"Result for Problem 60: {compute()}")
+    print(f"Result for Problem 60 is {compute()}")