Can'；t向python Tkinter添加标签

当我按下python表单上的按钮时，我想添加新标签并将其放在网格上。当我按下按钮时，什么也没发生

我的代码随附：

from Tkinter import *

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        topiclbl.grid()
        topictxt = Text(self,height=1, width=30,font=(12))
        topictxt.grid()
        searchbtn = Button(self,text = 'Search Videos',command='search')
        searchbtn.grid()

    def search(self):

        message = 'Searching...'
        self.topictxt.insert(0.0,message)
        searchlbl = Label(self,text = message,font=(12))
        searchlbl.grid()


root = Tk()
root.title('Video Search')
root.geometry('600x600')
app=Application(root)
root.mainloop()

---

创建时应将实际函数传递给

按钮

e、 g

---

代码中有几个问题：

您在

命令

参数中引用了错误的方法名称，应该是：

searchbtn=按钮（self，text='Search Videos'，command=self.Search）

另外，您还有一些属性问题：

您无法访问在此方法之外的

create\u widget

方法中定义的

topictxt

，除非将其设置为实例属性，方法如下：

self.topiclbl=Label（self，text='输入搜索主题'，font=（12））

。。。其余的也一样。为了解决这个问题：

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        self.topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        self.topiclbl.grid()
        self.topictxt = Text(self,height=1, width=30,font=(12))
        self.topictxt.grid()
        self.searchbtn = Button(self,text = 'Search Videos',command=self.search)
        self.searchbtn.grid()

    def search(self):

        message = 'Searching...'
        self.topictxt.insert(0.0,message)
        self.searchlbl = Label(self,text = message,font=(12))
        self.searchlbl.grid()

另一种方法是使用

lambda

传递所需的对象（标签）：

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        topiclbl.grid()
        topictxt = Text(self,height=1, width=30,font=(12))
        topictxt.grid()
        searchbtn = Button(self,text = 'Search Videos',command=lambda: self.search(topictxt))
        searchbtn.grid()

    def search(self, wdgt):

        message = 'Searching...'
        wdgt.insert(0.0,message)
        searchlbl = Label(self,text = message,font=(12))
        searchlbl.grid()

class Application(Frame):

    def __init__(self,master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        topiclbl = Label(self,text = 'Enter topic for search',font=(12))
        topiclbl.grid()
        topictxt = Text(self,height=1, width=30,font=(12))
        topictxt.grid()
        searchbtn = Button(self,text = 'Search Videos',command=lambda: self.search(topictxt))
        searchbtn.grid()

    def search(self, wdgt):

        message = 'Searching...'
        wdgt.insert(0.0,message)
        searchlbl = Label(self,text = message,font=(12))
        searchlbl.grid()