When I tried to change the window icon in the top left corner from the ugly red &quot;TK&quot; to my own favicon using the code below, Python threw an error:

    from tkinter import *
    root = Tk()

    #some buttons, widgets, a lot of stuff
    
    root.iconbitmap(&#39;favicon.ico&#39;)
    
This should set the icon to &#39;favicon.ico&#39; (according to a lot of forum posts all over the web). But unfortunately, all this line does is throw the following error:

&lt;!-- language: lang-none --&gt;

    Traceback (most recent call last):
      File &quot;d:\ladvclient\mainapp.py&quot;, line 85, in &lt;module&gt;
        root.iconbitmap(bitmap=&#39;favicon.ico&#39;)
      File &quot;C:\Python33\lib\tkinter\__init__.py&quot;, line 1637, in wm_iconbitmap
        return self.tk.call(&#39;wm&#39;, &#39;iconbitmap&#39;, self._w, bitmap)
    _tkinter.TclError: bitmap &quot;favicon.ico&quot; not defined

What I already did:

 - I checked the path - everything is 100% correct
 - I tried other file formats like `.png` or `.bmp` - none worked
 - I looked this problem up on many websites

And for the third point, effbot.org, my favorite site about Tkinter, told me that Windows ignores the `iconbitmap` function.
But this doesn&#39;t explain why it throws an error!

There are some &quot;hackish&quot; ways to avoid that issue, but none of them are Written for Python 3.x.

So my final question is: Is there a way to get a custom icon using Python 3.x and Tkinter?

Also, don&#39;t tell me I should use another GUI Library.  I want my program to work on every platform. I also want a coded version, not a `py2exe` or `sth` solution.

    

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Why isn't .ico file defined when setting window's icon?