Tkinter - columnspan doesn't seem to affect Message
<p>I've trying to create a simple interface in Python (2.7) with Tkinter featuring a user-input box, browse button and description on the first row and a multi-line explanation spanning their width on the line below. </p>

<p>My issue is that the <code>columnspan</code> option doesn't seem to allow my <code>Message</code> widget to span the width of the three columns above, as can be seen below:</p>

<p><a href="https://i.stack.imgur.com/Cqa97.jpg" rel="nofollow"><img src="https://i.stack.imgur.com/Cqa97.jpg" alt="Non-spanning message box"></a></p>

<p>How can I get this <code>Message</code> to span the entire width? I've additionally tried using the <code>width</code> parameter but this seems to be of a different scale to that for the <code>Entry</code> widget.</p>

<p>My code is as follows:</p>

<pre><code>from Tkinter import *

class App(Frame):

    def __init__(self, *args, **kwargs):
        Frame.__init__(self, *args, **kwargs)
        self.grid(sticky=N + W + E + S)

        # set up labels and buttons
        self.folder_text = Label(
            self, text='Select Folder:  ', font='Arial 10', anchor=W
        )
        self.folder_text.grid(row=0, column=0, sticky=W)

        self.input_folder = Entry(
            self, width=40, font='Arial 10'
        )
        self.input_folder.grid(row=0, column=1)

        self.browse_button = Button(
            self, text="Browse", font='Arial 8 bold',
            command=lambda: self.browse_for_folder(self.input_folder)
        )
        self.browse_button.grid(row=0, column=2)

        self.desc = Message(
            self, text='This tool will create a .csv file in the specified folder containing the Time and '
                       'Latitude/Longitude (WGS84) for all TIFF, RAW and JPEG/JPG files contained in the '
                       'folder with this information available.', font='Arial 8', anchor=W
        )
        self.desc.grid(row=1, column=0, columnspan=3, sticky=E + W)

        self.run_button = Button(
            self, text="Run!", font='Arial 10 bold', fg='red',
            command=lambda: self.run(self.input_folder)
        )

        self.run_button.grid(row=2, column=1)

# ---SNIP---

root = Tk()
root.bind('&lt;Escape&gt;', lambda e: root.destroy())
root.resizable(0, 0)
root.title('Get photo geolocations')

app = App(root)
root.mainloop()
</code></pre>

<p>The <code>Message</code> uses an aspect ratio or a character width to determine its size.</p>

<p>You can give it a width and then it will work:</p>

<pre><code>    self.desc = Message(
        self, text='This tool will create a .csv file in the specified folder containing the Time and '
                   'Latitude/Longitude (WGS84) for all TIFF, RAW and JPEG/JPG files contained in the '
                   'folder with this information available.', font='Arial 8', anchor=W, width = 400
    )
</code></pre>

<p><a href="https://i.stack.imgur.com/rUcdX.png" rel="nofollow"><img src="https://i.stack.imgur.com/rUcdX.png" alt="enter image description here"></a></p>

<p>Alternatively, you can render the window, read out its width with <code>root.geometry()</code>, set the width on the widget, then set the text into it.</p>

python tkinter