Tkinter标签更改不适用于任何方法

Question

我正在与我的Python Tkinter GUI进行斗争。我想更新PickedFileName的文本以更改为PickFileButton（）中的文件名。在线结果表明，我可以使用StringVar（）或.config（）实现这一点，但这两个选项似乎都不配合。使用StringVar（）仅将文本呈现为py_var0，而在运行代码时，使用.config（）似乎无法识别PickedFileName（即未定义）。我还想在按下ParseFileButton后为“[filename]generated”创建一个类似的标签，其中[filename.log]将变成[filename.txt]，但这也会看到类似的问题。其他一切似乎都是如此。 我在下面附上了一段相关代码

class App:
    def __init__(self, root):
        #setting title
        root.title("TF2 Log Parser")
        #setting window size
        width=500
        height=400
        screenwidth = root.winfo_screenwidth()
        screenheight = root.winfo_screenheight()
        alignstr = '%dx%d+%d+%d' % (width, height, (screenwidth - width) / 2, (screenheight - height) / 2)
        root.geometry(alignstr)
        root.resizable(width=False, height=False)

        ParserTitle=tk.Message(root)
        ParserTitle["font"] = 'Bahnschrift', 24
        ParserTitle["fg"] = "#333333"
        ParserTitle["justify"] = "center"
        ParserTitle["text"] = "Parser"
        ParserTitle.place(relx=0.05,rely=0.05,width=450,height=100)

        PickedFileName=tk.Label(root)
        PickedFileName["font"] = 'Bahnschrift', 24
        PickedFileName["fg"] = "#333333"
        PickedFileName["justify"] = "center"
        PickedFileName["text"] = ""
        PickedFileName.place(x=150,y=150,width=200,height=60)

        PickFileButton=tk.Button(root)
        PickFileButton["bg"] = "#efefef"
        ft = tkFont.Font(family='Times',size=10)
        PickFileButton["font"] = ft
        PickFileButton["fg"] = "#000000"
        PickFileButton["justify"] = "center"
        PickFileButton["text"] = "Select File"
        PickFileButton.place(x=150,y=200,width=200,height=46)
        PickFileButton["command"] = self.PickFileButton_command

        ParseFileButton=tk.Button(root)
        ParseFileButton["bg"] = "#efefef"
        ft = tkFont.Font(family='Times',size=10)
        ParseFileButton["font"] = ft
        ParseFileButton["fg"] = "#000000"
        ParseFileButton["justify"] = "center"
        ParseFileButton["text"] = "Parse"
        ParseFileButton.place(x=170,y=330,width=160,height=38)
        ParseFileButton["command"] = self.ParseFileButton_command

    def PickFileButton_command(self):
        global filepath
        filepath = filedialog.askopenfilename(initialdir=os.getcwd(), title="Select Log File",
                                        filetypes =(("logs", "*.log"),("All Files", "*.*")))
        global fileName
        fileName = os.path.basename(filepath)
        global fileValidity
        print(fileName)
        if fileName.endswith('.log') == True:
            statLogs = lp.logParse(filepath)
            global gameStats
            gameStats = statLogs[0]
            global playerStats
            playerStats = statLogs[1]
            fileValidity = True
            label.config()
        else:
            messagebox.showerror("Invalid File", "Invalid file or no file submitted. PLease select a .log file.")
            fileValidity = False

    def ParseFileButton_command(self):
        if fileValidity == True:
            global playerStats
            playerStats = lc.statCalculations(playerStats, gameStats)
            lo.finalOutput(fileName, gameStats, playerStats)
        else:
            messagebox.showerror("Invalid File", "Invalid file or no file submitted. Please select a .log file before parsing.")


if __name__ == "__main__":
    root = tk.Tk()
    app = App(root)
    root.mainloop()

我是不是走错路了？谢谢你的阅读

Answer 1

在init函数中，通过将self.添加到小部件实例的开头，将所有小部件实例更改为类属性。比如说

PickedFileName=tk.Label(root)

变成

self.PickedFileName=tk.Label(root) 

然后，修改PickFileButton_command方法以更改

label.config()

到

self.PickedFileName["text"] = fileName

这会将标签文本更新为选定文件名的文本