「テキスト」ウィジェット内に埋め込まれた2つの「エントリ」の相対的な幅を指定する

Within a text widget? No, there is no direct support for relative widths. within a frame? yes. If you are putting them in a text widget (I presume, so you can scroll them) you have to manage the widths yourself. You can add a binding to the event of the text widget. This fires when the text widget changes size, and you can resize all the widgets at that point.

最も簡単な方法は、 grid を使用してフレームに配置し、フレームをキャンバスに置き、スクロールできるようにすることです。

ここに例があります：

import Tkinter as tk

class SampleApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        self.canvas = tk.Canvas(self, width=200, highlightthickness=0)
        self.vsb = tk.Scrollbar(orient="vertical", command=self.canvas.yview)
        self.canvas.configure(yscrollcommand=self.vsb.set)
        self.vsb.pack(side="right", fill="y")
        self.canvas.pack(side="left", fill="both", expand=True)

        self.container = tk.Frame(self.canvas, borderwidth=0, highlightthickness=0)
        self.container.grid_columnconfigure(0, weight=1)
        self.container.grid_columnconfigure(1, weight=1)
        for i in range(30):
            e1 = tk.Entry(self.container)
            e2 = tk.Entry(self.container)
            e1.grid(row=i, column=0,sticky="ew")
            e2.grid(row=i, column=1,sticky="ew")
            e1.insert(0, "find %s" % i)
            e2.insert(0, "replace %s" % i)

        self.canvas.create_window((0,0), anchor="nw", window=self.container, tags="container")
        self.canvas.configure(scrollregion=self.canvas.bbox("all"))
        self.canvas.bind("", self.OnCanvasConfigure)

    def OnCanvasConfigure(self, event):
        self.canvas.itemconfigure("container", width=event.width)
        self.canvas.configure(scrollregion=self.canvas.bbox("all"))

if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()