由于中国大学mooc里课程的pdf文档不方便下载,因此这里敲一个能自动下载课程里所有pdf的代码: 窗体代码: from tkinter import * from tkinter.filedialog import askdirectory from down_main import download def center_window(tk: Tk, width: int, height: int): screenwidth = tk.winfo_screenwidth()