tkinter Text 小部件中的列宽是否可变？

Question

I'm trying to display a bill in a tkinter Text box, but I can't get all the columns (like name, price, etc.) to align. Is it because some letters are wider than others?

ct=5.0
for i in lst_bill:
    txt_bill.insert(ct,'\n' + str(int(ct-4)))  # for sl.no
    txt_bill.insert(tk.END,' '*11+i[0])
    txt_bill.insert(tk.END,' '*(40-len(i[0]))+str(i[1]))
    txt_bill.insert(tk.END,' '*(10-len(str(i[1]))) +i[2])
    ct+=1

lst_bill looks something like this:

[['Orange Cake', 20, 'milk'], ['Red Velvet Cake', 30, 'None'], 
 ['BlackCoffee', 5, 'None'], ['Pumpkin Pie', 10, 'Milk']]

Screenshot of current results

Answer 1

Yes, it is because you are using a variable-width font.

You can use tab stops instead of padding the data with spaces. For example, to set the tab stops at 50 pixels, 200 pixels, and then 250 pixels, and with the third column being right-justified you can do it like this:

txt_bill.configure(tabs="50 200 right 250")
ct=5.0
for i in lst_bill:
    txt_bill.insert("end", f"{int(ct-4)}\t{i[0]}\t{i[1]}\t{i[2]}\n")
    ct += 1

You might want to compute the widths based on the font and the maximum width of the data in each column, but this gives the general idea.

The canonical description of how to define tabstops is in the tcl/tk documentation for the text widget.