[Python] Tkinter command

例1：创建按钮

import tkinter as tk
class App:
    def __init__(self,root):
        frame = tk.Frame(root)
        frame.pack()
        self.hi_there = tk.Button(frame,text='hello',fg='blue',
                                  command=self.say_hi)
        self.hi_there.pack(side=tk.LEFT)
    def say_hi(self):
        print("大家好")

root = tk.Tk()
app = App(root)
root.mainloop()

例2：

import tkinter as tk

T = [1,2,3]
class App:
    def __init__(self,root):
        frame = tk.Frame(root)
        frame.pack()
        self.hi_there = tk.Button(frame,text='hello',fg='blue',command=lambda:self.say_hi(T))
        self.hi_there.pack(side=tk.LEFT)
    def say_hi(self,t):
        t.append(4)
        print(t)

root = tk.Tk()
app = App(root)
root.mainloop()

参考：

https://www.cnblogs.com/shwee/p/9427975.html

https://blog.csdn.net/vevenlcf/article/details/82226531

http://www.17python.com/blog/23

https://blog.csdn.net/ahilll/article/details/81531587

https://www.zhihu.com/question/30665278