How would one create a simple spreadsheet with Tkinter?

Tkinter does not have a fancy spreadsheet like widget like wxPython. However, you could create a matrix of Entry widgets and go from there.

I hope any of the Python experts can elaborate on this a little more for us beginners.

Spreadsheets are really not that difficult to make with Python. Here is the beginning of a simple Tkinter based spreadsheet program:

# the beginning of a simple Tkinter spreadsheet

import Tkinter as tk

root = tk.Tk()
root.title('Tkinter spreadsheet phase 1')

def click(event, cell):
    # can do different things with right (3) and left (1) mouse button clicks
    root.title("you clicked mouse button %d in cell %s" % (event.num, cell))
    # test right mouse button for equation solving
    # eg. data = '=9-3' would give 6
    if event.num == 3:
        # entry object in use
        obj = dict[cell]
        # get data in obj
        data = obj.get()
        # if it starts with '=' it's an equation
        if data.startswith('='):
            eq = data.lstrip('=')
            print data, eq
            try:
                # solve the equation
                result = eval(eq)
                #print result, type(result)  # test
                # remove equation data
                obj.delete(0, 'end')
                # update cell with equation result
                obj.insert(0, str(result))
            except:
                pass

def key_r(event, cell):
    # return/enter has been pressed
    data = dict[cell].get()  # get text/data in given cell
    #print cell, dict[cell], data  # test
    root.title("cell %s contains %s" % (cell, data))

# create a dictionary of key:value pairs
dict = {}
w = 20
h = 1
alpha = ["", 'A', 'B', 'C', 'D', 'E', 'F']
for row in range(5):
    for col in range(5):
        if col == 0:
            # create row labels
            label1 = tk.Label(root, width=3, text=str(row))
            label1.grid(row=row, column=col, padx = 2, pady=2)
        elif row == 0:
            # create column labels
            label1 = tk.Label(root, width=w, text=alpha[col])
            label1.grid(row=row, column=col, padx = 2, pady=2)            
        else:
            # create entry object
            entry1 = tk.Entry(root, width=w)
            # place the object
            entry1.grid(row=row, column=col)  #, padx = 2, pady=2)
            # create a dictionary of cell:object pair
            cell = "%s%s" % (alpha[col], row)
            dict[cell] = entry1
            # bind the object to a left mouse click
            entry1.bind('<Button-1>', lambda e, cell=cell: click(e, cell))
            # bind the object to a right mouse click
            entry1.bind('<Button-3>', lambda e, cell=cell: click(e, cell))
            # bind the object to a return/enter press
            entry1.bind('<Return>', lambda e, cell=cell: key_r(e, cell))


#print dict  # test

# set the focus on cell A1
dict['A1'].focus()


root.mainloop()

Right now I am using the right mouse button click to evaluate equations starting with '=', for instance a cell data of '=355/113.0' would give the approximation of pi. Still to do --> summing rows or columns of cells using something like '=sum(A1..A4)' needs to be parsed and evaluated. You also have to add a data save and load, plus a few more items. Give me an idea of what you need. Hopefully someone else will chime in too!

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