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    <p>The problem is that you handle <code>&lt;KeyRelease&gt;</code> instead of <code>&lt;KeyPress&gt;</code> (or <code>&lt;Return&gt;</code>). </p> <p>At the time the <code>&lt;KeyRelease&gt;</code> event is raised, the text widget has already been updated with the newline. And because text was selected, that selected text got simply replaced with the newline (as it would have been replaced by pressing any other key).</p> <p>So better bind to <code>&lt;KeyPress&gt;</code> or <code>&lt;Return&gt;</code> instead of <code>&lt;KeyRelease&gt;</code>.</p> <hr> <p>I think the easiest way to solve your issue is indeed to handle both <code>&lt;KeyRelease&gt;</code> and <code>&lt;Return&gt;</code> seperatly. </p> <p>(You could get it to work using <code>&lt;KeyPress&gt;</code>, but this would involve checking which key is pressed, manually inserting this key to the text, checking which text is selected, and replacing the selected text; so, it will be rather clunky).</p> <pre><code>def handle_keyrelease(event): global text if event.keysym in validkeysymchars: for x in ['testcommand']: strtocmp = text.get("MARK","end") strtocmp = strtocmp.encode('ascii','ignore') strtocmp = strtocmp.strip() print strtocmp if x.startswith(strtocmp): currpos = text.index(INSERT) text.insert(END,x[len(strtocmp):]) text.tag_add(SEL,currpos,"%s+%dc"%(currpos,len(x)-len(strtocmp))) text.mark_set("insert",currpos) return def handle_return(event): text.tag_remove(SEL,"1.9",END) text.mark_set("insert",END) text.insert(END, "\n") text.insert(END, "command&gt;") text.mark_set("MARK",INSERT) text.mark_gravity("MARK",LEFT) return "break" ... text.bind("&lt;KeyRelease&gt;", handle_keyrelease) text.bind("&lt;Return&gt;", handle_return) ... </code></pre>
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    1. COActually, I was using `KeyPress` event handler first but I was getting another strange problem. My autocomplete code was not running with the `KeyPress` event handler and forced me to use `KeyRelease` handler. I have updated my code, can you please comment on why it was not working with `KeyPress` event handler. Just simply type `t` on text widget, you'll notice that in case of `KeyRelease`, it will insert `testcommand` in text widget while with `KeyPress` nothing happens.
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    2. COIt looks like in case of `KeyPress`, previous key is read only once new character is inserted. So is the only solution is to use `KeyRelease` for auto complete and use `KeyPress` for `Return` key or it could be handled in more efficient way?
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    3. CO@sarbjit You could indeed use a single `<KeyPress>` handler, but that would be rather ugly and complicated. Best use two seperate handler. See my edit.
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