Reference a variable that is inside a "with open" block inside a function

Question

def write_lor():
    with open("data.txt", 'r+') as filehandle:
        filecontents = filehandle.readlines()
        filehandle.seek(0)
        new = (int(filecontents[0])+1)
        filehandle.write(str(new))
        filehandle.truncate()

This is a basic counter sort of system that saves to a txt. Is there anyway to reference the variable new later down the line? For example my usage is:

button1 = Button(frame, text=("Left On Read:\n", **VARIABLE**), fg="black", bg="white", height = 5, width = 20, command=write_lor)

with the variable needing to be the variable new referenced in the function above.

You'll have to make it a global variable; there's no way to access the local variable `new` after `write_lor` returns. — chepner, Jun 26 '21 at 15:33
You could update the text inside the button from inside your function. — quamrana, Jun 26 '21 at 15:34

score 0 · Accepted Answer · answered Jun 26 '21 at 17:07

0

def write_lor():
    with open("data.txt", 'r+') as filehandle:
        filecontents = filehandle.readlines()
        filehandle.seek(0)
        global lor
        lor = (int(filecontents[0])+1)
        filehandle.write(str(lor)+ "\n")

answered Jun 26 '21 at 17:07

OhItsTom

39
4

1

Please add documentation explaining why this solution works, what it targets, and the problem it tries to address. – Skarlett Jun 26 '21 at 18:16
1

Please be more elaborate, provide an [explanation](https://meta.stackoverflow.com/questions/392712/explaining-entirely-code-based-answers) for your answer. – rawrex Jun 27 '21 at 03:09

Reference a variable that is inside a "with open" block inside a function

1 Answers1