Is “x < y < z" faster than "x < y and y < z"?

The difference is that in x < y < z y is only evaluated once. This does not make a large difference if y is a variable, but it does when it is a function call, which takes some time to compute.

from time import sleep
def y():
    sleep(.2)
    return 1.3
%timeit 1.2 < y() < 1.8
10 loops, best of 3: 203 ms per loop
%timeit 1.2 < y() and y() < 1.8
1 loops, best of 3: 405 ms per loop