如何在 tkinter 中添加第二行？

Question

我需要使用计算函数将第二行添加到与第一行相同的位置。这段代码该怎么做import tkinter as tkroot = tk.Tk()root.geometry('850x450')var1 = tk.StringVar()t1 = tk.Entry(root, textvariable=var1).grid(row=1,column=1)var2 = tk.StringVar()t2 = tk.Entry(root, textvariable=var2).grid(row=1,column=2)result = tk.StringVar()l = tk.Label(root, textvariable=result).grid(row=1,column=3)N = 3 # number of decimals that you wantdef set_label(name, index, mode):    if var1.get() == '' or var2.get() == '':        pass    else:        res = float(var1.get()) * float(var2.get())        result.set('{number:.{digits}f}'.format(number=res, digits=N))var1.trace('w', set_label)var2.trace('w', set_label)root.mainloop()提前致谢...

Answer 1

如果要创建多行小部件，可以创建一个数组来存储小部件引用，并使用循环在网格中创建小部件。

import tkinter as tk

root = tk.Tk()

root.geometry('850x450')

lstentry = []  # all entries

lstlabel = []  # all labels

for ctr in range(5):   # 5 rows

    var1 = tk.StringVar()

    t1 = tk.Entry(root, textvariable=var1).grid(row=ctr+1,column=1)

    var2 = tk.StringVar()

    t2 = tk.Entry(root, textvariable=var2).grid(row=ctr+1,column=2)

    result = tk.StringVar()

    result.set('label ' +str(ctr+1))

    l = tk.Label(root, textvariable=result).grid(row=ctr+1,column=3)

    lstentry.append(var1)

    lstentry.append(var2)

    lstlabel.append(l)

N = 3 # number of decimals that you want

def set_label(name, index, mode):

    if var1.get() == '' or var2.get() == '':

        pass

    else:

        res = float(var1.get()) * float(var2.get())

        result.set('{number:.{digits}f}'.format(number=res, digits=N))

var1.trace('w', set_label)

var2.trace('w', set_label)

root.mainloop()

输出

Answer 2

将行创建逻辑与功能分开add_row(row_number)：

import tkinter as tk

root = tk.Tk()

root.geometry('850x450')

def add_row(row_number):

    var1 = tk.StringVar()

    t1 = tk.Entry(root, textvariable=var1).grid(row=row_number,column=1)

    var2 = tk.StringVar()

    t2 = tk.Entry(root, textvariable=var2).grid(row=row_number,column=2)

    result = tk.StringVar()

    l = tk.Label(root, textvariable=result).grid(row=row_number,column=3)

    N = 3 # number of decimals that you want

    def set_label(name, index, mode):

        if var1.get() == '' or var2.get() == '':

            pass

        else:

            res = float(var1.get()) * float(var2.get())

            result.set('{number:.{digits}f}'.format(number=res, digits=N))

    var1.trace('w', set_label)

    var2.trace('w', set_label)

NUMBER_OF_ROWS = 10

for row_number in range(1, NUMBER_OF_ROWS+1):

    add_row(row_number)

root.mainloop()