python tkinter用于循环使用和图像未加载 [英] python tkinter for loop used and image not loading

问题描述

我的图像未加载。我不知道。这是我的代码的一部分。我的图像尺寸在高度和宽度上都较小。出于某种原因，也仅显示最后一张图像：

My image is not loading. I have no idea. Here is part of my code. The size of my image are small in height and width. Also only the last image shows for some reason:

lenlist1 = len(list1)
""" Displays text and photo """
for i in range(lenlist1):
    name = list1[i]
    Pic = Piclist[i]

    height = i * 400

    canvas.create_text(1,height,text=name,anchor=tkinter.NW)
    pic = tkinter.PhotoImage(file = Pic)
    root.pic = pic

    height2 = (i*400) + 20
    canvas.create_image(1,height2,image=pic, anchor = tkinter.NW)




frame.pack()

推荐答案

每次通过该循环，变量 pic 被分配一个新的 tkinter.PhotoImage 对象。如果附加到该名称的先前对象没有其他引用，则将对其进行垃圾收集。如所述此处：

Each time through that loop, the variable pic is assigned a new tkinter.PhotoImage object. If the previous object that was attached to that name has no other references to it, it is garbage-collected. As stated here:

您必须在Python程序中保留对图像对象的引用，方法是将其存储在全局变量中或将其附加到另一个对象。

You must keep a reference to the image object in your Python program, either by storing it in a global variable, or by attaching it to another object.

当PhotoImage对象被Python垃圾回收时（例如，当您从将图像存储在局部变量中的函数返回时），即使Tkinter小部件正在显示该图像，也会清除该图像。

When a PhotoImage object is garbage-collected by Python (e.g. when you return from a function which stored an image in a local variable), the image is cleared even if it’s being displayed by a Tkinter widget.

为避免这种情况，程序必须保留对图像对象的额外引用。

To avoid this, the program must keep an extra reference to the image object.

，您可以将每个 pic 附加到列表中，以便每个图像始终都有对其的引用。

For example, you could append each pic to a list so that each image always has a reference to it.

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