Python How to edit a Tkinter label from within a function?

Question

I need to change a Tkinter label from inside a function but it isn't passing through correctly because I get the error

AttributeError: 'NoneType' object has no attribute 'config'

My code is

from Bio.Seq import Seq
from Bio.Alphabet import IUPAC
from Bio import SeqIO
from tkinter import *
from tkinter import ttk, filedialog
import os

def select_file(fileLabel):
    filename = filedialog.askopenfilename(initialdir=".")
    name, extension = os.path.splitext(filename)
    extension=''.join(extension.split('.', 1))
    for seq_record in SeqIO.parse(filename, extension):
        sequence = seq_record.seq
    fileBase=os.path.basename(os.path.normpath(filename))
    fileLabel.config(text=fileBase)


tk = Tk()

fileLabel = ttk.Label(text = "No File Selected").pack()

ttk.Button(text = "Select FASTA/Genbank",command = lambda: select_file(fileLabel)).pack()

tk.mainloop()

Does anyone know what I'm doing wrong?

Edit: The error is on the line

fileLabel.config(text=fileBase)

On which line are you getting the error? – Chuk Ultima Dec 01 '19 at 15:44 — Chuk Ultima, Dec 01 '19 at 15:44

score 0 · Accepted Answer · answered Dec 01 '19 at 16:05

0

Try this :

fileLabel = ttk.Label(text = "No File Selected")
fileLabel.pack()

answered Dec 01 '19 at 16:05

Chuk Ultima

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Python How to edit a Tkinter label from within a function?

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