逐行标记

贯穿 n07 的程序（一个小仓库），每行标了它碰的数据：

1  total = total + amount          # 共享 total，写
2  log = []                        # 本地
3  log.append("入库")               # 本地
4  if stock >= need:               # 共享 stock，读（检查）
5      stock = stock - need        # 共享 stock，写（动作）
6  count = count + 1               # 共享 count，写
7  print(total)                    # 共享 total，只读
8  name = name.upper()             # 本地

按规则标记：碰共享数据的行标 Y，本地的标 n；再列出要保护的共享数据名（去重、按首次出现）：

LINES = [(1, "total", "w"), (2, None, None), (3, None, None), (4, "stock", "r"), (5, "stock", "w"), (6, "count", "w"), (7, "total", "r"), (8, None, None)]

marks = "".join("Y" if v else "n" for _, v, _ in LINES)
shared = []
for _, v, _ in LINES:
    if v and v not in shared:
        shared.append(v)
print(marks + "/" + ",".join(shared))