Python Tkinter将数据从数据库显示到新窗口

我正在制作一个具有查看数据库功能的管理系统。我想在用户单击“查看列表”按钮时弹出一个新窗口，显示数据库。我将“list”函数保存为一个新的.py文件，并使用主文件中下面的代码调用它

def listCustomer():
call(["python", "list.py"])

但是，我似乎无法使数据显示在新窗口上，因为每次新窗口都是空窗口。谁能告诉我我做错了什么？我将为下面的list.py文件附加代码

from tkinter import *
from PIL import ImageTk,Image
import sqlite3

root = Tk()


def list():
    #Create database
    connect = sqlite3.connect("hmsdata.db")
    #Create cursor
    c = connect.cursor()

    #List database
    c.execute("SELECT *, oid FROM details")
    data = c.fetchall()
    showData=''
    for data in details:
        showData += str(data)+"\n"

    dataLabel = Label(root, text=showData)
    dataLabel.grid(row=0, column=0)

    #Commit changes
    connect.commit()
    #Close connection
    connect.close()

这就是我单击“查看客户”按钮时发生的情况，它不显示任何内容

---

您可以使用常规方法-

导入列表

，然后执行

列表.list（）

。这样，您就可以更好地控制windows

但它需要使用

Toplevel

来创建第二个窗口

最少的工作示例

main.py

import tkinter as tk  # PEP8: `import *` is not preferred
import list as ls     # `list` is use to create list - don't use this name

# --- functions ---

def on_click():
    # run method `list()` from file `list`
    ls.list()

# --- main ---

root = tk.Tk()

button = tk.Button(root, text='Second', command=on_click)
button.pack()

root.mainloop()

import tkinter as tk  # PEP8: `import *` is not preferred

def list():
    second = tk.Toplevel()  # create inside function

    dataLabel = tk.Label(second, text="Hello World")
    dataLabel.grid(row=0, column=0)

import tkinter as tk  # PEP8: `import *` is not preferred

second = None  # to control if window is open

def on_close():
    global second
    
    second.destroy()
    second = None  # to control if window is open
    
def list():
    global second
    
    if second: # if second is not None:
        print('Window already open')
    else:
        second = tk.Toplevel()

        dataLabel = tk.Label(second, text="Hello World")
        dataLabel.grid(row=0, column=0)

        button = tk.Button(second, text='Close', command=on_close)
        button.grid(row=1, column=0)

list.py

import tkinter as tk  # PEP8: `import *` is not preferred
import list as ls     # `list` is use to create list - don't use this name

# --- functions ---

def on_click():
    # run method `list()` from file `list`
    ls.list()

# --- main ---

root = tk.Tk()

button = tk.Button(root, text='Second', command=on_click)
button.pack()

root.mainloop()

import tkinter as tk  # PEP8: `import *` is not preferred

def list():
    second = tk.Toplevel()  # create inside function

    dataLabel = tk.Label(second, text="Hello World")
    dataLabel.grid(row=0, column=0)

import tkinter as tk  # PEP8: `import *` is not preferred

second = None  # to control if window is open

def on_close():
    global second
    
    second.destroy()
    second = None  # to control if window is open
    
def list():
    global second
    
    if second: # if second is not None:
        print('Window already open')
    else:
        second = tk.Toplevel()

        dataLabel = tk.Label(second, text="Hello World")
        dataLabel.grid(row=0, column=0)

        button = tk.Button(second, text='Close', command=on_close)
        button.grid(row=1, column=0)

---

顺便说一句：在您的版本中，您可能忘记执行

list（）

---

编辑：

检查窗口是否尚未打开的版本（

main.py

相同）

list.py

import tkinter as tk  # PEP8: `import *` is not preferred
import list as ls     # `list` is use to create list - don't use this name

# --- functions ---

def on_click():
    # run method `list()` from file `list`
    ls.list()

# --- main ---

root = tk.Tk()

button = tk.Button(root, text='Second', command=on_click)
button.pack()

root.mainloop()

import tkinter as tk  # PEP8: `import *` is not preferred

def list():
    second = tk.Toplevel()  # create inside function

    dataLabel = tk.Label(second, text="Hello World")
    dataLabel.grid(row=0, column=0)

import tkinter as tk  # PEP8: `import *` is not preferred

second = None  # to control if window is open

def on_close():
    global second
    
    second.destroy()
    second = None  # to control if window is open
    
def list():
    global second
    
    if second: # if second is not None:
        print('Window already open')
    else:
        second = tk.Toplevel()

        dataLabel = tk.Label(second, text="Hello World")
        dataLabel.grid(row=0, column=0)

        button = tk.Button(second, text='Close', command=on_close)
        button.grid(row=1, column=0)

---

使用普通的

import list

和

list.list（）

而不是

调用（[“python”，“list.py]”）

-然后您可以从主脚本中控制第二个窗口。要创建第二个窗口，您需要使用

顶级

而不是

Tk

，如果这是

list.py

中的完整代码，那么您忘了执行函数

list（）