Tkinter: How to make a rounded corner text widget?

One solution is to use a ttk frame with a custom style that uses an image for the corners.
The following example is adapted from a tcl/tk solution I wrote back in 2007. It uses an odd color for the focus, and requires a white background, but you could create your own image to replace the one used in this solution (or edit the image in this example¹)
# adapted from http://wiki.tcl.tk/%0920152
import tkinter as tk
from tkinter import ttk

focusBorderImageData=""'
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'''

borderImageData=""'
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root = tk.Tk()
style = ttk.Style()
borderImage = tk.PhotoImage("borderImage", data=borderImageData)
focusBorderImage = tk.PhotoImage("focusBorderImage", data=focusBorderImageData)

style.element_create("RoundedFrame",
                     "image", borderImage,
                     ("focus", focusBorderImage),
                     border=16, sticky="nsew")
style.layout("RoundedFrame",
             [("RoundedFrame", {"sticky": "nsew"})])

frame1 = ttk.Frame(style="RoundedFrame", padding=10)
text1 = tk.Text(frame1, borderwidth=0, highlightthickness=0, wrap="word",
                width=40, height=4)
text1.pack(fill="both", expand=True)

text1.bind("<FocusIn>", lambda event: frame1.state(["focus"]))
text1.bind("<FocusOut>", lambda event: frame1.state(["!focus"]))
text1.insert("end", "This widget has the focus")

frame2 = ttk.Frame(style="RoundedFrame", padding=10)
text2 = tk.Text(frame2, borderwidth=0, highlightthickness=0, wrap="word",
                width=40, height=4)
text2.pack(fill="both", expand=True)
text2.bind("<FocusIn>", lambda event: frame2.state(["focus"]))
text2.bind("<FocusOut>", lambda event: frame2.state(["!focus"]))
text2.insert("end", "This widget does not have the focus")

root.configure(background="white")
frame1.pack(side="top", fill="both", expand=True, padx=20, pady=20)
frame2.pack(side="top", fill="both", expand=True, padx=20, pady=20)

frame1.focus_set()

root.mainloop()
¹The image data is a base64-encoded gif. If you decode the data and save it to a .gif file, you can edit it to use any colors you want.
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