I think there is a typo in “Chapter 4: Advanced Control Flow” at “A Random Interlude” before the first “while” code example. It says “rolling a die” instead of “rolling a dice”.
@shogunkaramazov Thank you very much for your clarification and sorry for my terrible English. Please, delete this topic. It has no use to be here any longer. Thanks.
Your English is not that bad. 
According to the Oxford Dictionary, “Historically, dice is the plural of die, but in modern standard English dice is both the singular and the plural: throw the dice could mean a reference to either one or more than one dice.”
Most people never refer to one of them as a die; using dice for both singular and plural is more common these days.
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