我是python新手，所以我试图制作一个GUI，因为我必须将一个按钮放在一个特定的位置。在
我试着用self.nxt_form.place(x=200,y=100)代替self.nxt_form.pack()。在
但是按钮不见了，只有画面出现了。你能告诉我怎么把按钮放在特定的位置吗？在
代码如下：import tkinter as tk
class Main_form:
def __init__(self, root,title="Simulated MTBF"):
self.root = root
self.frame = tk.Frame(self.root)
"""Button nxt_form which moves to next form"""
self.nxt_form = tk.Button(self.frame, text = 'Next Form', width = 25,command = self.new_window)
self.nxt_form.pack()
self.frame.pack()
"""command to open new window by clicking Button """
def new_window(self):
self.newWindow = tk.Toplevel(self.root)
self.app = Demo2(self.newWindow)
class Demo2:
def __init__(self, root):
self.root = root
self.frame = tk.Frame(self.root)
self.quitButton = tk.Button(self.frame, text = 'Quit', width = 25, command = self.close_windows)
self.quitButton.pack()
self.frame.pack()
def close_windows(self):
self.root.destroy()
def main():
root = tk.Tk()
app = Main_form(root)
root.mainloop()
if __name__ == '__main__':
main()
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