Tkinter Entry Field Capture AttributeError:

Question

I want to capture the data in the entry field from the second window defined under output. When I click submit get the following message: AttributeError: 'NoneType object has no attribute 'get'.

I feel like this should be an easy fix and do not understand why can't I capture the data from the entry field?

from tkinter import *
import xlsxwriter

class MyFirstGUI:
    def __init__ (self, master):
        master.title("Main")
        master.geometry("400x400+230+160")

        button1 = Button(master, text="1", command= self.output).grid(row=0, column=0)


    def output(self):

        cw1= Toplevel(root)
        cw1.title("cw1")
        cw1.geometry("400x300+160+160")

        self.b2 = Button(cw1, text="Submit",command = self.write_to_xlsx).grid(row=0, column=2) 
        self.l2 = Label(cw1, text="New Specimen").grid(row=0, column=0)

        self.e2 = Entry(cw1).grid(row=0, column=1)


    def write_to_xlsx(self):

        workbook = xlsxwriter.Workbook('tkintertest19.xlsx')
        worksheet = workbook.add_worksheet()
        worksheet.write_string('C1', self.e2.get())
        workbook.close() 


root = Tk()
my_gui = MyFirstGUI(root)
root.mainloop()

score 1 · Accepted Answer · answered Jul 07 '17 at 20:27

1

What you need to do is split the line

self.l2 = Label(cw1, text="New Specimen").grid(row=0, column=0)

into

self.l2 = Label(cw1, text = "New Specimen")
self.l2.grid(row=0, column=0)

Non-intuitive as this may seem, the grid/pack/place functions return None, so the whole shebang (Label().grid()) returns None. The solution is simply to split it up so that you get the right thing when you use .get().

answered Jul 07 '17 at 20:27

Auden Young

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The reason @heather splits the line is because the grid(...) at the end of the Label command actually returns None, whereas the Label(...) command returns the label object -- which is what you want. – Ron Norris Jul 07 '17 at 20:29
@RonNorris, already edited to add that in (before your comment); apologies for not putting that in right off the bat. – Auden Young Jul 07 '17 at 20:30
@heather Thank you!! Easy fix – applestooragnes Jul 07 '17 at 20:36
@RonNorris Thanks ! – applestooragnes Jul 07 '17 at 20:37

Tkinter Entry Field Capture AttributeError:

1 Answers1