Tkinter入门
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# Patterns

To use a label, you just have to specify what to display in it (this can be text, a bitmap, or an image):

        w = Label(master, text="Hello, world!")

If you don't specify a size, the label is made just large enough to hold its contents. You can also use the `height` and `width` options to explicitly set the size. If you display text in the label, these options define the size of the label in text units. If you display bitmaps or images instead, they define the size in pixels (or other screen units). See the `Button` description for an example how to specify the size in pixels also for text labels.

You can specify which color to use for the label with the `foreground` (or `fg`) and `background` (or `bg`) options. You can also choose which font to use in the label (the following example uses Tk 8.0 font descriptors). Use colors and fonts sparingly; unless you have a good reason to do otherwise, you should stick to the default values.

        w = Label(master, text="Rouge", fg="red")
        w = Label(master, text="Helvetica", font=("Helvetica", 16))

Labels can display multiple lines of text. You can use newlines or use the `wraplength` option to make the label wrap text by itself. When wrapping text, you might wish to use the `anchor` and `justify` options to make things look exactly as you wish. An example:

        w = Label(master, text=longtext, anchor=W, justify=LEFT)

You can associate a variable with the label. When the contents of the variable changes, the label is automatically updated:

        v = StringVar()
        Label(master, textvariable=v).pack()
        v.set("New Text!")

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