首先让我说我对编码非常新。我拼凑了一些代码，根据输入3个Entry字段的数据计算了一个等式。我有它，所以当我点击“计算”时，它评估方程并给我一个答案。有没有办法让它自动计算，这样我就不必在每组条目后点击计算？理想情况下，用户只需选项卡，输入数据，选项卡，输入数据，选项卡，输入数据，然后使用给出的答案。然后，他们将通过回到初始输入字段重复该过程。

下面是我的代码的副本：

from tkinter import *

from math import *

def show_entry_fields():

a, b, c = float(e1.get()), float(e2.get()), float(e3.get())

s = (a + b + c) / 2

height = (sqrt (s * (s - a) * (s - b) * (s - c)) * 2) / b

height = float(format(height, '.3f'))

height_label['text'] = str(height)

side =(sqrt ((a ** 2) - (height ** 2)))

side = float(format(side, '.3f'))

side_label['text'] = str(side)

master = Tk()

master.attributes("-topmost", True)

Label(master, text="Measurement from nearest to 0+00").grid(row=5, column=0, sticky=W, pady=4)

e1 = Entry(master)

e1.grid(row=5, column=1, sticky=E)

Label(master, text="Distance between points on Station Line").grid(row=6, column=0, sticky=W, pady=4)

e2 = Entry(master)

e2.grid(row=6, column=1, sticky=E)

Label(master, text="Measurement from farthest from 0+00").grid(row=7, column=0, sticky=W, pady=4)

e3 = Entry(master)

e3.grid(row=7, column=1, sticky=E, pady=4)

Label(master, text="Offset from station line").grid(row=8, column=0, sticky=W, pady=4)

height_label = Label(master, text="")

height_label.grid(row=8, column=1)

Label(master, text="Feet from Measurement nearest to 0+00").grid(row=9, column=0, sticky=W, pady=4)

side_label = Label(master, text="")

side_label.grid(row=9, column=1)

Button(master, text='Calculate', command=show_entry_fields).grid(row=10, column=0, pady=4)

mainloop()

解决办法：

有几种方法可以做到这一点，但由于数学运算很简单，root.after用来计算你的结果。基本上它会尝试每0.1秒计算一次，如果没有捕获到错误则显示结果。

from tkinter import *

from math import *

def show_entry_fields():

try:

a, b, c = float(e1.get()), float(e2.get()), float(e3.get())

s = (a + b + c) / 2

height = (sqrt(s * (s - a) * (s - b) * (s - c)) * 2) / b

height = float(format(height, '.3f'))

height_label['text'] = str(height)

side = (sqrt((a ** 2) - (height ** 2)))

side = float(format(side, '.3f'))

side_label['text'] = str(side)

except ValueError: #catch empty field or invalid input error

pass

master.after(100, show_entry_fields)

...

master.after(100,show_entry_fields) # add this

master.mainloop()