在下面的代码中,单击该按钮应将黑色文本从Hello更改为再见。但当我运行这个程序时,它马上就说再见了。在
from Tkinter import *
from tkMessageBox import *
print "this is a test"
class Demo(Frame):
def __init__(self):
self.createGUI()
print "init"
#self.__mainWindow = Tk()
def destroy(self):
print "destroy"
def createGUI(self):
Frame.__init__(self)
self.pack(expand = YES, fill = BOTH)
self.master.title("Demo")
self.trackLabel = StringVar()
self.trackLabel.set("Hello")
self.trackDisplay = Label(self, font = "Courier 14", textvariable = self.trackLabel, bg = "black", fg = "green")
self.trackDisplay.grid(sticky = W+E+N+S)
self.button1 = Button(self, text = "Click Me", width = 10, command = self.bpress())
self.button1.grid(row = 2, column = 0, sticky = W+E+N+S)
def bpress(self):
self.trackLabel.set("Goodbye")
# run the program
def main():
tts = Demo()
tts.mainloop()
if __name__ == "__main__":
main()
因为您在创建
self.button1
按钮时正在调用self.bpress
:只需删除括号并将
^{pr2}$command
分配给self.bpress
函数对象本身:供将来参考:
如果要向函数发送参数,只需添加
lambda:
使用
callback()
命令的按钮示例:相关问题 更多 >
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