CODEWITHSUNDEEP
python-3.xtkinter
Glenn Ledder
Glenn Ledder

Reputation: 21

Code not working trying to write the content of a StringVar to a file

I've got a lot of experience with basic programming, but none with GUI programming, and I am teaching myself Python 3 with tkinter for that purpose. I've got some great answers by checking stackoverflow posts, but now I've got a problem that doesn't seem to have been covered. I want my program to get user input from an Entry widget and write that data to a file. After stripping out all nonessential lines, my current code is

from tkinter import *
from tkinter import ttk

root = Tk()

sheetid = StringVar()

def finish():
    with open('C:/Python33/data.txt', 'w') as f:
        f.write('first line of text\n')
    with open('C:/Python33/data.txt', 'a') as f:
        f.write(sheetid)

main = Frame(root).grid()
ttk.Entry(main, textvariable="sheetid").grid(row=0, column=1)
ttk.Button(main, text="Close", command=finish).grid(column=1)

root.mainloop()

I've previously used the Label widget to write the variable "sheetid"in a window, so I know the combination of Entry widget and the "Close" Button widget are working. The first write statement works, so I know my file-opening code is correct. The second write gives a run-time error:

TypeError: must be str, not StringVar.

Next I tried converting "sheetid" to a string, using

s = str(sheetid,'\n')

but this also returned a run-time error:

TypeError: coercing to str: need bytes, bytearray or buffer-like object, StringVar found.

Surely there is a way to do this, but my google search hasn't found it.

Thanks!

Upvotes: 0

Views: 3548

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385970

You cannot use ..., textvariable="sheetid", you must use ..., textvariable=sheetid, ... (notice the lack of quotes around sheetid). And then, when you want to write the value out you must use sheetid.get().

Upvotes: 3

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