如果没有条目，我如何让Tkinter Entry.get()等于0？

from tkinter import *

root = Tk()

# 创建Entry并设置默认值为0
entry = Entry(root, width=30)
entry.insert(0, "0")
entry.pack()

# 获取Entry的值
value = entry.get()
print(value)  # 输出0

root.mainloop()

from tkinter import *

root = Tk()

def get_value():
    value = entry.get()
    if not value:  # 判断输入是否为空
        value = "0"
    print(value)  # 输出0

entry = Entry(root, width=30)
entry.pack()

button = Button(root, text="Get Value", command=get_value)
button.pack()

root.mainloop()