Tkinter标签文本不出现

Question

我使用的是这段代码（来自https://www.python-course.eu/tkinter_labels.php），但标签上没有文本。

CREATE VIEW stats AS
  select COUNT(DISTINCT publisher.name) as totalPublisher,
  select COUNT(DISTINCT series.name) as totalSeries
 From
  publisher,
  series

我怀疑任何问题都可能涉及import tkinter as tk root = tk.Tk() w = tk.Label(root, text="Hello Tkinter!") w.pack() root.mainloop() 函数。