Hangman question

[eschneider92]

I'm  on chapter 9 of this guide to python: 
http://inventwithpython.com/chapter9.html     but I don't quite understand why 
line 79 is what it is (blanks = blanks[:i] + secretWord[i] + blanks[i+1:]). I 
particularly don't get the [i+1:] part. Any additional information and help 
would be greatly appreciated!
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