[Python] Applying a function to values in dict

I want to apply a function to all values in dict and store that in a separate dict. I am just trying to see how I can play with python and want to see how I can rewrite something like this

for i in d:
d2 = f(d)


to something like

d2 = f(d) for i in d


The first way of writing it is of course fine, but I am trying to figure how python syntax can be changed

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