lots of cleanup

advent/common/input.py

@@ -0,0 +1,19 @@
+from pathlib import Path, PurePath
+from typing import Iterator, TypeVar
+
+T = TypeVar('T')
+
+
+def read_lines(day: int, file_name: str) -> Iterator[str]:
+    '''
+    Returns an iterator over the content of the mentioned file
+    All lines are striped of an eventual trailing '\n' their
+    '''
+    with open(
+        Path.cwd()
+        / PurePath('advent/days/day{0:02}/data'.format(day))
+        / PurePath(file_name),
+        'rt',
+    ) as file:
+        while line := file.readline():
+            yield line.rstrip('\n')