Data commit

Task/Periodic-table/Python/periodic-table.py

@@ -0,0 +1,46 @@
+def perta(atomic) -> (int, int):
+
+    NOBLES = 2, 10, 18, 36, 54, 86, 118
+    INTERTWINED = 0, 0, 0, 0, 0, 57, 89
+    INTERTWINING_SIZE = 14
+    LINE_WIDTH = 18
+
+    prev_noble = 0
+    for row, noble in enumerate(NOBLES):
+        if atomic <= noble:  # we are at the good row. We now need to determine the column
+            nb_elem = noble - prev_noble  # number of elements on that row
+            rank =  atomic - prev_noble  # rank of the input element among elements
+            if INTERTWINED[row] and INTERTWINED[row] <= atomic <= INTERTWINED[row] + INTERTWINING_SIZE:  # lantanides or actinides
+                row += 2
+                col = rank + 1
+            else:  # not a lantanide nor actinide
+                # handle empty spaces between 1-2, 4-5 and 12-13.
+                nb_empty = LINE_WIDTH - nb_elem  # spaces count as columns
+                inside_left_element_rank = 2 if noble > 2 else 1
+                col = rank + (nb_empty if rank > inside_left_element_rank else 0)
+            break
+        prev_noble = noble
+    return row+1, col
+
+
+
+# small test suite
+
+TESTS = {
+    1: (1, 1),
+    2: (1, 18),
+    29: (4,11),
+    42: (5, 6),
+    58: (8, 5),
+    59: (8, 6),
+    57: (8, 4),
+    71: (8, 18),
+    72: (6, 4),
+    89: (9, 4),
+    90: (9, 5),
+    103: (9, 18),
+}
+
+for input, out in TESTS.items():
+    found = perta(input)
+    print('TEST:{:3d} -> '.format(input) + str(found) + (f' ; ERROR: expected {out}' if found != out else ''))