performance - why simple for loop with if condition is faster than conditional generator expression in python -

why loop if condition in first case more 2 times faster second case conditional generator expression?

%%timeit in range(100000):     if < 10000:         continue     pass 

clocks @ 100 loops, best of 3: 2.85 ms per loop, while using generator expression:

%%timeit in (i in range(100000) if >= 10000):     pass 

100 loops, best of 3: 6.03 ms per loop

first version: each element in range: assign i.

second version: each element in range: assign inner i (third 1 left), evaluate expression i (the i ...(i for... assign result "outer" (leftmost) i.

the if statements have similar performance impact in both versions.