2024: d03: ex2: add solution

Rely on my having installed `nix-direnv`.

2024/d02/ex1/ex1.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
-import sys
 import itertools
+import sys
 
 Report = list[int]
 

2024/d02/ex2/ex2.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
-import sys
 import itertools
+import sys
 
 Report = list[int]
 

2024/d03/ex1/ex1.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 
-import sys
-import re
 import dataclasses
+import re
+import sys
 
 
 @dataclasses.dataclass

2024/d03/ex2/ex2.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python
 
-import sys
-import re
 import dataclasses
+import re
+import sys
 
 
 @dataclasses.dataclass

flake.nix

@@ -43,6 +43,10 @@
                 enable = true;
               };
 
+              ruff = {
+                enable = true;
+              };
+
               ruff-format = {
                 enable = true;
               };

ruff.toml

@@ -0,0 +1,8 @@
+[lint]
+extend-select = [
+    "I", # Import sorting is a lint check
+]
+ignore = [
+    "E731", # Assigning lambdas is sometimes more readable
+    "E741", # Ambiguous variable names are good enough actually
+]