這是一個使用 tkinter gui 添加 2 個數字的小型 Python 程序。如果文本字段中有一些輸入，它運行良好。如果輸入為空白或數字以外的字符，如何處理導致的錯誤。from tkinter import *root = Tk()class addtwo: def evaluate(self, master, label, a, b): label.configure(text="The result is" + str(a+b)) def __init__(self, master): frame = Frame(master, width=300, height=200) button1 = Button(master, text="Sum") input1 = Entry(master, text="Text1") input2 = Entry(master, text="Text2") label = Label(master, text="") button1.bind("<Button-1>", lambda event: self.evaluate(master, label,int(input1.get()),int(input2.get()) )) input1.pack() input2.pack() frame.focus() button1.pack() label.pack() frame.pack()addtwo(root) root.mainloop()錯誤：Exception in Tkinter callbackTraceback (most recent call last): File "/usr/lib/python3.5/tkinter/__init__.py", line 1553, in __call__ return self.func(*args) File "/home/temporary/PycharmProjects/practise/addtwo.py", line 21, in <lambda> button1.bind("<Button-1>", lambda event: self.evaluate(master, label,int(input1.get()),int(input2.get()) ))ValueError: invalid literal for int() with base 10: ''
1 回答
慕村225694
TA貢獻1880條經驗 獲得超4個贊
您可以使用try/except捕獲錯誤并顯示一些消息Label而不是結果。
import tkinter as tk
class AddTwo:
def __init__(self, master):
frame = tk.Frame(master, width=300, height=200)
self.input1 = tk.Entry(master, text="Text1")
self.input2 = tk.Entry(master, text="Text2")
button1 = tk.Button(master, text="Sum", command=self.evaluate)
self.label = tk.Label(master, text="")
self.input1.pack()
self.input2.pack()
button1.pack()
self.label.pack()
frame.pack()
frame.focus()
def evaluate(self):
a_str = self.input1.get()
b_str = self.input2.get()
try:
a = int(a_str)
b = int(b_str)
except ValueError:
self.label['text'] = "Wrong value(s) {} and/or {}".format(a_str, b_str)
return
self.label['text'] = "The result is {}".format(a+b)
# --- main ---
root = tk.Tk()
AddTwo(root)
root.mainloop()
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