如何放置一个代码，如果按下按钮，则会弹出一条消息？

Question

基本上我今天是学习Python的，我正在尝试制作我的第一个项目，这将是一个hang子手游戏，没什么特别的，只是要开始制作的东西。关于我的问题..如果按下某个键，如何弹出消息？我知道它是print（“ Message”）。但是，如何“检测”是否按下了某个键？这是代码（如我所说，该代码不是高级的。我今天开始学习）：from tkinter import *root = Tk()topFrame = Frame(root)topFrame.pack()bottomFrame = Frame(root)bottomFrame.pack(side=BOTTOM)A = Button(topFrame, text="A", bg="green", fg="white")B = Button(topFrame, text="B", bg="green", fg="white")C = Button(topFrame, text="C", bg="green", fg="white")D = Button(topFrame, text="D", bg="green", fg="white")E = Button(topFrame, text="E", bg="green", fg="white")F = Button(topFrame, text="F", bg="green", fg="white")G = Button(topFrame, text="G", bg="green", fg="white")H = Button(topFrame, text="H", bg="green", fg="white")I = Button(topFrame, text="I", bg="green", fg="white")J = Button(topFrame, text="J", bg="green", fg="white")K = Button(topFrame, text="K", bg="green", fg="white")L = Button(topFrame, text="L", bg="green", fg="white")M = Button(topFrame, text="M", bg="green", fg="white")N = Button(topFrame, text="N", bg="green", fg="white")O = Button(topFrame, text="O", bg="green", fg="white")P = Button(topFrame, text="P", bg="green", fg="white")Q = Button(topFrame, text="Q", bg="green", fg="white")R = Button(topFrame, text="R", bg="green", fg="white")S = Button(topFrame, text="S", bg="green", fg="white")T = Button(topFrame, text="T", bg="green", fg="white")U = Button(topFrame, text="U", bg="green", fg="white")V = Button(topFrame, text="V", bg="green", fg="white")W = Button(topFrame, text="W", bg="green", fg="white")X = Button(topFrame, text="X", bg="green", fg="white")Y = Button(topFrame, text="Y", bg="green", fg="white")Z = Button(topFrame, text="Z", bg="green", fg="white")A.pack(side=LEFT)B.pack(side=LEFT)C.pack(side=LEFT)D.pack(side=LEFT)E.pack(side=LEFT)if A is pressed:    print("Wrong letter, that's a strike!")root.mainloop()我试过了如果按A：print（“字母错误，这是警告！”）它不起作用。

Answer 1

当您单击按钮时，tkinter主循环会捕获该事件并查找事件。要将我们的代码与按钮单击事件连接起来，我们应该通过命令参数传递事件发生时要运行的内容。首先，您必须定义单击按钮时我们要发生的事情。

由于print函数在控制台而不是gui中显示输出，因此使用print（）显示输出毫无意义。如果我们使用标签在gui本身中显示输出，那就更好了。

def on_click():
    label.config(text = 'Wrong letter! that's a strike')

为此，我们应该在gui中添加标签。这可以通过

label = Label(root,font = 'size,20')
label.pack(side = 'bottom')

最后，我们可以配置按钮代码。

A = Button(topFrame, text="A", bg="green", fg="white", command=on_click)

当我们单击按钮时，这将使文本显示在标签上。

Answer 2

只需将command属性添加到您要用来打印行的按钮上即可。我已经为下面的按钮A完成了此操作：

from tkinter import *

root = Tk()

topFrame = Frame(root)

topFrame.pack()

bottomFrame = Frame(root)

bottomFrame.pack(side=BOTTOM)

A = Button(topFrame, text="A", bg="green", fg="white", command=lambda: print("Wrong letter, that's a strike!"))

B = Button(topFrame, text="B", bg="green", fg="white")

C = Button(topFrame, text="C", bg="green", fg="white")

D = Button(topFrame, text="D", bg="green", fg="white")

E = Button(topFrame, text="E", bg="green", fg="white")

F = Button(topFrame, text="F", bg="green", fg="white")

G = Button(topFrame, text="G", bg="green", fg="white")

H = Button(topFrame, text="H", bg="green", fg="white")

I = Button(topFrame, text="I", bg="green", fg="white")

J = Button(topFrame, text="J", bg="green", fg="white")

K = Button(topFrame, text="K", bg="green", fg="white")

L = Button(topFrame, text="L", bg="green", fg="white")

M = Button(topFrame, text="M", bg="green", fg="white")

N = Button(topFrame, text="N", bg="green", fg="white")

O = Button(topFrame, text="O", bg="green", fg="white")

P = Button(topFrame, text="P", bg="green", fg="white")

Q = Button(topFrame, text="Q", bg="green", fg="white")

R = Button(topFrame, text="R", bg="green", fg="white")

S = Button(topFrame, text="S", bg="green", fg="white")

T = Button(topFrame, text="T", bg="green", fg="white")

U = Button(topFrame, text="U", bg="green", fg="white")

V = Button(topFrame, text="V", bg="green", fg="white")

W = Button(topFrame, text="W", bg="green", fg="white")

X = Button(topFrame, text="X", bg="green", fg="white")

Y = Button(topFrame, text="Y", bg="green", fg="white")

Z = Button(topFrame, text="Z", bg="green", fg="white")

A.pack(side=LEFT)

B.pack(side=LEFT)

C.pack(side=LEFT)

D.pack(side=LEFT)

E.pack(side=LEFT)

F.pack(side=LEFT)

G.pack(side=LEFT)

H.pack(side=LEFT)

I.pack(side=LEFT)

J.pack(side=LEFT)

K.pack(side=LEFT)

L.pack(side=LEFT)

M.pack(side=LEFT)

N.pack(side=LEFT)

O.pack(side=LEFT)

P.pack(side=LEFT)

Q.pack(side=LEFT)

R.pack(side=LEFT)

S.pack(side=LEFT)

T.pack(side=LEFT)

U.pack(side=LEFT)

V.pack(side=LEFT)

W.pack(side=LEFT)

X.pack(side=LEFT)

Y.pack(side=LEFT)

Z.pack(side=LEFT)

root.mainloop()