Make a new dictionary, removing some keys and without changing the original

Question

What's the quickest way to make a new dictionary (minus one key) out of an old one without changing the original?

e.g.

input= {potato : 10, book2 : 182, book17 : 12}

make a new dict without book2 without changing the original input

returning = {potato : 10, book17 : 12}

Answer 1

copy first

d_returning = dict(d_input)

Then delete

del d_returning['book2']