Entry grid widget identifier with tkinter gui

Question

On this link is this code example that generates a entry grid:

from tkinter import *
 
 
class Table:
     
    def __init__(self,root):
         
        # code for creating table
        for i in range(total_rows):
            for j in range(total_columns):
                 
                self.e = Entry(root, width=10, fg='blue',
                               font=('Arial',16,'bold'))
                 
                self.e.grid(row=i, column=j)
                self.e.insert(END, lst[i][j])
 
# take the data
lst = [(1,'Raj','Mumbai',19),
       (2,'Aaryan','Pune',18),
       (3,'Vaishnavi','Mumbai',20),
       (4,'Rachna','Mumbai',21),
       (5,'Shubham','Delhi',21)]
  
# find total number of rows and
# columns in list
total_rows = len(lst)
total_columns = len(lst[0])
  
# create root window
root = Tk()
root.geometry("800x600")
t = Table(root)
root.mainloop()

This is the output:

I want to update 1st row, 2nd column. How do I do that? I know that once I named an Entry I can use the following code:

    self.e.delete(0, END)
    self.e.insert(0, "update string")

but since I used grid I do not know how to identify one particular Entry from that grid.

Thanks.

Answer 1

You can create a 2-D list to store the references of those Entry widgets, then you can use this list to update the entry you want.

Also I would suggest:

• pass lst to Table.__init__() instead of accessing it directly
• create class methods to get and set value of specific entry using row and column

from tkinter import *


class Table:

    def __init__(self, root, values):

        total_rows = len(values)
        total_columns = len(values[0])

        # create a 2-D list to store the entry widgets
        self.entries = [[None]*total_columns for _ in range(total_rows)]

        # code for creating table
        for i in range(total_rows):
            for j in range(total_columns):
                e = Entry(root, width=10, fg='blue', font=('Arial',16,'bold'))
                e.grid(row=i, column=j)
                e.insert(END, values[i][j])
                self.entries[i][j] = e  # store entry into list

    # function to get value of entry at (row, col)
    def get(self, row, col):
        try:
            return self.entries[row][col].get()
        except IndexError as ex:
            print("Error on Table.get():", ex)

    # function to set value of entry at (row, col)
    def set(self, row, col, value):
        try:
            self.entries[row][col].delete(0, "end")
            self.entries[row][col].insert("end", value)
        except IndexError as ex:
            print("Error on Table.set():", ex)


# take the data
lst = [(1,'Raj','Mumbai',19),
       (2,'Aaryan','Pune',18),
       (3,'Vaishnavi','Mumbai',20),
       (4,'Rachna','Mumbai',21),
       (5,'Shubham','Delhi',21)]

# create root window
root = Tk()
root.geometry("800x600")

t = Table(root, lst) # pass lst to Table()

# update entry at row 0 column 1
t.set(0, 1, "hello")

root.mainloop()