Renamed solutions and inputs adding leading 0 for better sorting

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2020-python/solutions/day_04.py

@@ -0,0 +1,72 @@
+"""AOC Day 4"""
+
+import pathlib
+import time
+import re
+
+def read_input(input_path: str) -> list:
+    """take input file path and return appropriate data structure"""
+    with open(input_path, 'r') as input_file:
+        data = input_file.read()
+        entries = re.split(r"(?:\r?\n){2,}", data.strip())
+        passports = list()
+        for entry in entries:
+            passport = dict()
+            entry = entry.replace('\n', ' ')
+            data = entry.split(' ')
+            for field in data:
+                key, value = field.split(':')[:2]
+                passport[key] = value
+            passports.append(passport)
+        return passports
+
+def check_fields(passport: dict) -> bool:
+    """check if a passport contains all the required fields"""
+    required_fields = ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"]
+    for required_field in required_fields:
+        if required_field not in passport.keys():
+            return False
+        elif passport[required_field] == None or passport[required_field] == '':
+            return False
+    return True
+
+def check_data(passport: dict) -> bool:
+    """check if all passport fields contains correct data"""
+    return (1920 <= int(passport["byr"]) <= 2002 and
+        2010 <= int(passport["iyr"]) <= 2020 and
+        2020 <= int(passport["eyr"]) <= 2030 and
+        ((passport["hgt"].endswith("cm") and 150 <= int(passport["hgt"][:-2]) <= 193) or (passport["hgt"].endswith("in") and 59 <= int(passport["hgt"][:-2]) <= 76)) and
+        re.match(r"^#[0-9a-f]{6}$", passport["hcl"]) and
+        passport["ecl"] in ("amb", "blu", "brn", "gry", "grn", "hzl", "oth") and
+        re.match(r"^[0-9]{9}$", passport["pid"]))
+
+def part1(entries: list) -> int:
+    """part1 solver take a list of strings and return an int"""
+    valid_passports = 0
+    for passport in entries:
+        if check_fields(passport):
+            valid_passports += 1
+    return valid_passports
+
+
+def part2(entries: list) -> int:
+    """part2 solver take a list of tuples and return an int"""
+    valid_passports = 0
+    for passport in entries:
+        if check_fields(passport) and check_data(passport):
+            valid_passports += 1
+    return valid_passports
+
+def main():
+    """main function"""
+    input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
+    start_time = time.time()
+    entries = read_input(input_path)
+    print("Part 1: %d" % part1(entries))
+    print("Part 2: %d" % part2(entries))
+    end_time = time.time()
+    print("Execution time: %f" % (end_time-start_time))
+
+
+if __name__ == "__main__":
+    main()