Passport validation thing whee

aoc2020/day04/solution.py

@@ -0,0 +1,52 @@
+import sys
+import typing
+
+
+def main() -> int:
+    checked = [passport.is_valid() for passport in _read_passports(sys.stdin)]
+    print(f"total={len(checked)} valid={checked.count(True)}")
+    return 0
+
+
+NoneString = typing.Optional[str]
+
+
+class Passport:
+    byr: NoneString = None
+    cid: NoneString = None
+    ecl: NoneString = None
+    eyr: NoneString = None
+    hcl: NoneString = None
+    hgt: NoneString = None
+    iyr: NoneString = None
+    pid: NoneString = None
+
+    def is_valid(self) -> bool:
+        return all(
+            [
+                getattr(self, attr) is not None
+                for attr in ("byr", "ecl", "eyr", "hcl", "hgt", "iyr", "pid")
+            ]
+        )
+
+
+def _read_passports(
+    instream: typing.BinaryIO,
+) -> typing.Generator[None, None, Passport]:
+    cur = Passport()
+
+    for i, line in enumerate(instream):
+        line = line.strip()
+        if line == "":
+            yield cur
+            cur = Passport()
+
+        for pair in line.split():
+            attr, value = pair.split(":", 1)
+            setattr(cur, attr, value)
+
+    yield cur
+
+
+if __name__ == "__main__":
+    sys.exit(main())