如何避免在tkinter中从条目计算平均值时被零除的错误

import tkinter as tk

def calculate_average():
    values = []
    for entry in entry_list:
        value = entry.get()
        if value.isdigit():
            values.append(int(value))
    
    total = sum(values)
    count = len(values)
    
    if count != 0:
        average = total / count
        result_label.config(text="Average: {:.2f}".format(average))
    else:
        result_label.config(text="No values entered.")

root = tk.Tk()

entry_list = []
for i in range(5):
    entry = tk.Entry(root)
    entry.pack()
    entry_list.append(entry)

calculate_button = tk.Button(root, text="Calculate", command=calculate_average)
calculate_button.pack()

result_label = tk.Label(root)
result_label.pack()

root.mainloop()