python用tkinter写的记事本,连续查找字符串函数,运行程序,结果能出来,但是窗口也死了_course

def find_char(self,event = None): target = simpledialog.askstring("简易文本编辑器","寻找字符串") if target: end = self.st.index(tk.END) print(end) endindex = end.split(".") end_line = int(endindex[0]) end_column = int(endindex[1]) pos_line =1 pos_column=0 length =len(target) while pos_line <= end_line : if pos_line == end_line and pos_column +length > end_column: break elif pos_line < end_line and pos_column + length >500: pos_line = pos_line + 1 pos_column = (pos_column + length) -500 if pos_column > end_column: break else: pos = str(pos_line)+"."+str(pos_column) where = self.st.search(target,pos,tk.END) if where: print(where) where1 =where.split(".") sele_end_col = str(int(where1[1])+length) sele = where1[0] + "."+ sele_end_col self.st.tag_add(tk.SEL,where,sele) self.st.mark_set(tk.INSERT,sele) self.st.see(tk.INSERT) self.st.focus() again = messagebox.askokcancel(title = "继续查询么") if again: pos_line = int(where1[0]) pos_column = int(sele_end_col) else: aa=messagebox.showinfo(title = "你终于还是放弃了我",message = "你放弃了我--!") if aa: sys.exit()