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[ichabod801]

It's a way to do a weighted random selection. You have a dictionary of words and their weight (the value). You make a random number from 1 to the total of the weights (that's what is in randIndex). Then you go through the words and subtract each word's value from randIndex (randIncex -= value is equivalent to randIndex = randIndex - value). When randIndex gets to zero or less, that is your weighted random choice. It makes it so that a word with value v is selected with a probability v / t, where t is the sum of all the values.

In 3.6+, the random module has choices, which can handle this for you more efficiently. However, prior to that you have to use code like the above.