Question

我是库存经理，我的库存如下

oldstock = {"A":100,"B":120,"C":150,"D":100,"E":230,"F":200,"G":180,"H":140,"I":90,"J":50}

但是，我从下面的每个容器中出售了一些物品（似乎字典的表述是最好的表示方式）

sale = [{"A":20},{"C":25},{"E":15},{"F":18},{"H":20},{"C":35},{"A":40},{"A":5},{"E":40},{"H":20}]

每箱销售完成后如何计算新库存？

Answer 1

更简洁易懂的方法如下：

for item in sale:
    for k, v in item.items():
        # an extra check, you can remove this if you know for sure that sale will never have any key which is not in oldstock
        if k in oldstock:
            oldstock[k] = oldstock[k] - v

print(oldstock)
# {'A': 35, 'B': 120, 'C': 90, 'D': 100, 'E': 175, 'F': 182, 'G': 180, 'H': 100, 'I': 90, 'J': 50}

希望这会有所帮助。祝你好运。

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