好吧,您可以仅通过引用键直接从值中减去。我认为这更简单。
>>> books = {}>>> books['book'] = 3 >>> books['book'] -= 1 >>> books {'book': 2}在您的情况下:
book_shop[ch1] -= 1

好吧,您可以仅通过引用键直接从值中减去。我认为这更简单。
>>> books = {}>>> books['book'] = 3 >>> books['book'] -= 1 >>> books {'book': 2}在您的情况下:
book_shop[ch1] -= 1