Started with 2020 because I need stars for Beeminder

2020/d2.py

@@ -0,0 +1,34 @@
+from lib import get_data
+
+
+def part_1(data):
+    r = 0
+    for line in data.splitlines():
+        pol, pas = line.split(": ")
+        nums, letter = pol.split(" ")
+        lo, hi = list(map(int, nums.split("-")))
+        c = pas.count(letter)
+        if c >= lo and c <= hi:
+            r += 1
+    print(r)
+
+    r = 0
+    for line in data.splitlines():
+        pol, pas = line.split(": ")
+        nums, letter = pol.split(" ")
+        lo, hi = list(map(int, nums.split("-")))
+        c = pas.count(letter)
+        if (pas[lo - 1] == letter or pas[hi - 1] == letter) and not (
+            pas[lo - 1] == letter and pas[hi - 1] == letter
+        ):
+            r += 1
+    print(r)
+
+
+def main():
+    data = get_data(__file__)
+    part_1(data)
+
+
+if __name__ == "__main__":
+    main()