Python import X or from X import Y? (performance)

Question

If there is a library from which I\'m going to use at least two methods, is there any difference in performance or memory usage between the following?

from X         


        

Answer 1

There is no memory or speed difference (the whole module has to be evaluated either way, because the last line could be Y = something_else). Unless your computer is from the 1980s it doesn't matter anyways.