in reply to one-line conditional print?

One of several ways: 

printf "There %s $_ piece%s of pizza left\n",
    $_==1 ? ('is','') : ('are','s') 
    for 0 .. 2;;
There are 0 pieces of pizza left
There is 1 piece of pizza left
There are 2 pieces of pizza left

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In Section Seekers of Perl Wisdom