I am having a struggle with my Python Tkinter GUI. I would like to update the text of PickedFileName to change to the fileName found in PickFileButton(). Results online indicate I can achieve this using StringVar() or .config(), but neither option seems to cooperate. Using StringVar() only renders the text as py_var0, and using .config() does not seem to recognise PickedFileName (i.e. not defined) when I run the code. I would also like to create a similar label of '[filename] generated' once ParseFileButton is pressed where [filename.log] would become [filename.txt], but this also sees similar issues. Everything else seems to function as accordingly. I have attached a snippet of the relevant code below.

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()

Am I approaching this wrong? Thank you for reading.

CodePudding user response：

In your init function change all of your widget instances to be class attributes by adding self. to the start of them. For example

PickedFileName=tk.Label(root)

becomes

self.PickedFileName=tk.Label(root) 

Then, modify your PickFileButton_command method to change

label.config()

to

self.PickedFileName["text"] = fileName

This will update the label's text to be that of the selected file name.