为什么这两行代码不能产生相同的结果?

时间:2019-05-17 21:48:49

标签: python python-3.x tkinter

我对python来说还很陌生,我试图用9个输入框设置TKinter接口。我使用下面的第一行代码来跟踪每个小部件的值,但是当我尝试使用下面的第二行来清理代码时,我发现所有三个嵌套数组都绑定到相同的3个小部件。我觉得这里缺少明显的东西。

data = [[StringVar(), StringVar(), StringVar()],
        [StringVar(), StringVar(), StringVar()],
        [StringVar(), StringVar(), StringVar()]]

data = [[StringVar() for i in range(3)]for x in range(3)]

编辑: 我要发布整个代码,

from tkinter import *
from tkinter import ttk, StringVar
import asyncio
import websockets

ip = "10.30.128.92"
port = 5678

root = Tk()
status = StringVar()


async def send_data(*args):
    buffer = [[0]*3]*3
    try:
        for i in range(3):
            for j in range(3):
                val = float(data[i][j].get())
                if 0 < val < 255:
                    buffer[i][j] = val
                elif val >= 255:
                    buffer[i][j] = 255
                else:
                    buffer[i][j] = 0
        print(buffer)
    except ValueError:
        pass
    status.set("Connecting...")
    root.update()
    await asyncio.sleep(1)

    try:
        async with websockets.client.connect("ws://{}:{}".format(ip, port)) as websocket:
            status.set("Connected")
            root.update()
            await asyncio.sleep(1)
            status.set("Transmitting Values")
            root.update()
            await asyncio.sleep(1.3)
            print("Connection at ws://{}:{} established".format(ip, port))
            print("Awaiting Server reply code")
            msg = await websocket.recv()
            print(msg)
            print("Transmitting RGB values")
            await websocket.send(str(buffer))
            status.set("Data Transmitted ✓")
            root.update()
            await asyncio.sleep(1)
            print("Closing connection at ws://{}:{}".format(ip, port))
            websocket.close()
    except ConnectionRefusedError:
        status.set("Unable to Connect")
        root.update()
        await asyncio.sleep(1)
        print("Unable to connect to server at w://{}:{}".format(ip, port))


def run(*args):
    asyncio.run(send_data(args))


root.title("LED Manager")
root.iconbitmap('exbICO.ico')

mainframe = ttk.Frame(root, padding=".3i")
mainframe.grid(column=0, row=0)
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

#Holds the values of each entry box
#data = [[StringVar(), StringVar(), StringVar()],
#        [StringVar(), StringVar(), StringVar()],
#        [StringVar(), StringVar(), StringVar()]]


data =[[StringVar() for i in range(3)] for x in range(3)]

print(data)
#Holds references to the entry box widgets
data_entry = [[0]*3]*3

#Creates ttk Entry widgets that feed into values of data[][] and the places them into the frame
for i in range(3):
    for j in range(3):
        data_entry[i][j] = ttk.Entry(mainframe, width=7, textvariable=data[i][j])
        data_entry[i][j].grid(column=i+1, row=j+2)
        data_entry[i][j].focus()

#Creates the labels on all entry boxes and buttons
ttk.Label(mainframe, textvariable=status).grid(column=4, row=2)
ttk.Label(mainframe, text="Red 0-255").grid(column=0, row=2)
ttk.Label(mainframe, text="Green 0-255").grid(column=0, row=3)
ttk.Label(mainframe, text="Blue 0-255").grid(column=0, row=4)
ttk.Label(mainframe, text="LED #1").grid(column=1, row=1)
ttk.Label(mainframe, text="LED #2").grid(column=2, row=1)
ttk.Label(mainframe, text="LED #3").grid(column=3, row=1)
ttk.Button(mainframe, text="Send", command=run).grid(column=4, row=3)

for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5)

root.bind('<Return>', run)
while True:
    try:
        root.update_idletasks()
        root.update()
    except TclError:
        sys.exit(0)

与列表注释一起运行时,与其他注释未注释的行相比,对我来说会产生不同的行为

1 个答案:

答案 0 :(得分:3)

他们做同样的事情:

collection.find("{},{imageData:0,thumbnail:0}")

产量:

  

from tkinter import * win = Tk() data = [[StringVar(), StringVar(), StringVar()], [StringVar(), StringVar(), StringVar()], [StringVar(), StringVar(), StringVar()]] print(data) data = [[StringVar() for i in range(3)]for x in range(3)] print(data)

  

[[<tkinter.StringVar object at 0x0000024E4EC16470>, <tkinter.StringVar object at 0x0000024E4EC162B0>, <tkinter.StringVar object at 0x0000024E4EE7E400>], [<tkinter.StringVar object at 0x0000024E4EF8B3C8>, <tkinter.StringVar object at 0x0000024E4EF8B438>, <tkinter.StringVar object at 0x0000024E4EF8B4A8>], [<tkinter.StringVar object at 0x0000024E4EF8B518>, <tkinter.StringVar object at 0x0000024E4EF8B588>, <tkinter.StringVar object at 0x0000024E4EF8B5F8>]]

如果您要问为什么[[<tkinter.StringVar object at 0x0000024E4EF8B6D8>, <tkinter.StringVar object at 0x0000024E4EF8B668>, <tkinter.StringVar object at 0x0000024E4EF8B748>], [<tkinter.StringVar object at 0x0000024E4EF8B780>, <tkinter.StringVar object at 0x0000024E4EF8B7B8>, <tkinter.StringVar object at 0x0000024E4EF8B7F0>], [<tkinter.StringVar object at 0x0000024E4EF8B828>, <tkinter.StringVar object at 0x0000024E4EF8B860>, <tkinter.StringVar object at 0x0000024E4EF8B898>]]!= 0x0000024E4EC16470(第一个实例)是因为该数字告诉您对象在内存中的位置。都是0x0000024E4EF8B6D8对象,但它们位于不同的位置。例如,我想象您的邻居也是StringVar对象,但是由于他们是您的邻居,因此它们具有不同的地址!