Use insert
method of the Text
widget. Minimal example:
import tkinter as tk
root = tk.Tk()
text = tk.Text(root)
text.pack()
def add_text():
# text.delete(1.0, tk.END) # Uncomment if you need to replace text instead of adding
text.insert(1.0, f"Some text\n")
tk.Button(root, text="Add text", command=add_text).pack()
root.mainloop()
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