用于在数据库中搜索的Python Tkinter GUI表单，但某些字段可以为空

import tkinter as tk

def search_database():
    # 获取用户输入的搜索条件
    name = name_entry.get()
    age = age_entry.get()
    # 判断字段是否为空
    if name == "":
        name = None
    if age == "":
        age = None
    # 在这里执行数据库搜索操作
    # ...

# 创建主窗口
window = tk.Tk()

# 创建表单组件
name_label = tk.Label(window, text="姓名：")
name_label.pack()
name_entry = tk.Entry(window)
name_entry.pack()

age_label = tk.Label(window, text="年龄：")
age_label.pack()
age_entry = tk.Entry(window)
age_entry.pack()

search_button = tk.Button(window, text="搜索", command=search_database)
search_button.pack()

# 运行主循环
window.mainloop()