day 4 challenge

day4/day4.py

@@ -0,0 +1,47 @@
+#! /usr/bin/env python3
+import re
+
+
+def main(inp):
+    inp = open(inp).read().split('\n\n')
+    valid_passeports = 0
+    for l in inp:
+        l = re.split('[\n\s]', l)
+        passeport = dict(p.split(':') for p in l)
+        if check_passeport(passeport):
+            valid_passeports += 1
+    print("Valid passeports ", valid_passeports)
+
+
+def check_passeport(passeport):
+    fields = [
+        ('byr', lambda v: 1920 <= int(v) <= 2002), # (Birth Year)
+        ('iyr', lambda v: 2010 <= int(v) <= 2020),  # (Issue Year)
+        ('eyr', lambda v: 2020 <= int(v) <= 2030),  # (Expiration Year)
+        ('hgt', validate_height),  # (Height)
+        ('hcl', lambda v: re.search("#[0-9a-f]{6}", v)),  # (Hair Color)
+        ('ecl', lambda v: v in ('amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth')),  # (Eye Color)
+        ('pid', lambda v: len(v) == 9 and v.isdecimal()),  # (Passport ID)
+        #'cid'  # Country id, ignored
+    ]
+    for field, validator in fields:
+            value = passeport.get(field)
+            if value is None:
+                return False
+            elif not validator(value):
+                return False
+    return True
+
+
+def validate_height(v):
+    unit = v[-2:]
+    height = int(v[:-2])
+    if unit == 'cm':
+        return 150 <= height <= 193
+    if unit == 'in':
+        return 59 <= height <= 76
+    return False
+
+
+if __name__ == "__main__":
+    main('input.txt')