在Python编程中，动态类型系统允许我们在运行时动态地定义和操作变量。Python提供了两个强大的内置函数eval和exec，它们允许我们在程序运行时动态地执行Python代码。这两个函数虽然功能强大，但也需要谨慎使用，以避免潜在的安全风险。本文将详细介绍eval和exec ...

Writing GUI programs involves two basic steps. First, you need to write the code to create the interface, with elements, such as menus, and widgets, such as buttons, labels and entry fields. You then ...