From e63eab257f956639b7fcef84cfb134501c328687 Mon Sep 17 00:00:00 2001
From: dece <shgck@pistache.land>
Date: Fri, 4 Dec 2020 15:52:56 +0100
Subject: [PATCH] Day 4

---
 2020/day4.py | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 2020/day4.py

diff --git a/2020/day4.py b/2020/day4.py
new file mode 100644
index 0000000..d5ae18b
--- /dev/null
+++ b/2020/day4.py
@@ -0,0 +1,63 @@
+import re
+import string
+
+
+REQ = ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"]
+
+
+def main():
+    with open("day4.txt", "rt") as f:
+        lines = [line.rstrip() for line in f.readlines()]
+    passports = get_passports(lines)
+
+    # Part 1
+    num_valids = 0
+    for passport in passports:
+        if all(k in passport for k in REQ):
+            num_valids += 1
+    print("Valids:", num_valids)
+
+    # Part 2
+    num_valids = 0
+    hair_re = re.compile(r"#[abcdef\d]{6}")
+    for passport in passports:
+        if not all(k in passport for k in REQ):
+            continue
+        if not (1920 <= int(passport["byr"]) <= 2002):
+            continue
+        if not (2010 <= int(passport["iyr"]) <= 2020):
+            continue
+        if not (2020 <= int(passport["eyr"]) <= 2030):
+            continue
+        if not (
+            (passport["hgt"].endswith("cm") and 150 <= int(passport["hgt"][:-2]) <= 193)
+            or (passport["hgt"].endswith("in") and 59 <= int(passport["hgt"][:-2]) <= 76)
+        ):
+            continue
+        if not hair_re.match(passport["hcl"]):
+            continue
+        if not passport["ecl"] in ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"]:
+            continue
+        if not (len(passport["pid"]) == 9 and all(c in string.digits for c in passport["pid"])):
+            continue
+        num_valids += 1
+    print("P2 valids:", num_valids)
+
+
+def get_passports(lines):
+    passports = []
+    passport = {}
+    for line in lines:
+        elements = line.split()
+        for element in elements:
+            k, v = element.split(":")
+            passport[k] = v
+        if not line:
+            passports.append(passport)
+            passport = {}
+    passports.append(passport)
+    return passports
+
+
+if __name__ == "__main__":
+    main()