Day 4: Passport Processing

Functions:

blank_line_split(text)	Split the text on a blank line.
parse_passport_entries(text)	Parse the passport entries separated by a blank-line in text.
is_valid(entry)	Verify whether the passport entry is valid.
count_valid(batch)	Count the number of valid passports in the batch.

blank_line_split(text: str) → List[str]

Split the text on a blank line.

>>> blank_line_split('X\nY\n\nZ')
['X\nY', 'Z']

Ensures

• len(result) == text.count("nn") + 1

parse_passport_entries(text: str) → List[Tuple[str, str]]

Parse the passport entries separated by a blank-line in text.

Requires

• PASSPORT_RE.fullmatch(text)

is_valid(entry: List[Tuple[str, str]]) → bool

Verify whether the passport entry is valid.

Ensures

• result == all(k in dict(entry) for k in _REQUIRED_KEYS)

count_valid(batch: str) → int

Count the number of valid passports in the batch.

Requires

• all(PASSPORT_RE.match(line) for line in blank_line_split(batch))

Ensures

• result >= 0