Baseball Game Python Solution with Tests

lcpy gen -n 682   # by problem number
lcpy gen -s baseball_game   # by problem name

Input: ops = ["5","2","C","D","+"]
Output: 30
Explanation:
"5" - Add 5 to the record, record is now [5].
"2" - Add 2 to the record, record is now [5, 2].
"C" - Invalidate and remove the previous score, record is now [5].
"D" - Add 2 * 5 = 10 to the record, record is now [5, 10].
"+" - Add 5 + 10 = 15 to the record, record is now [5, 10, 15].
The total sum is 5 + 10 + 15 = 30.

Input: ops = ["5","-2","4","C","D","9","+","+"]
Output: 27

Input: ops = ["1","C"]
Output: 0

class Solution:
    # Time: O(n)
    # Space: O(n)
    def cal_points(self, operations: list[str]) -> int:
        record: list[int] = []
        for op in operations:
            if op == "+":
                record.append(record[-1] + record[-2])
            elif op == "D":
                record.append(2 * record[-1])
            elif op == "C":
                record.pop()
            else:
                record.append(int(op))
        return sum(record)