Python - PyQt QInputDialog.getItem 应用程序丢弃的取消按钮问题

Question

调用 QInputDialog.getItem 后，如果我选择该选项并按 OK，一切正常。如果我按取消，就会出现问题，程序会因此错误而崩溃：

Process finished with exit code -1073740791 (0xC0000409)

调试后这个错误是我没有将数据加载到变量中：

(<class 'UnboundLocalError'>, UnboundLocalError("local variable 'link' referenced before assignment"), <traceback object at 0x000001BC8209DE00>)

如何处理，以便在按下取消后程序继续运行而不会崩溃？

query = "SELECT name FROM datasets"
datasets = cur.execute(query).fetchall()
items = ()
for dataset in datasets:
   items += dataset
item, ok = QInputDialog.getItem(self, "select input dialog", "list of languages", items, 0, False)
if ok and item:
   query = "SELECT name, file FROM datasets"
   datasets = cur.execute(query).fetchall()
   for dataset in datasets:
      if dataset[0] == item:
         link = dataset[1]
         dataset_name = "Meno datasetu: " + str(dataset[0].split("-")[0])

Answer 1

在访问之前尝试初始化链接

link = None
item, ok = QInputDialog.getItem(self, "select input dialog", "list of languages", items, 0, False)
if ok and item:
  ...