In this code, why is the second output faster than the first!?

Both do almost the same thing and have the same result.

from timeit import timeit

lst = [0] * 10000000

txt1 = "any(i % 2 for i in lst)"
txt2 = "any(True for i in lst if i % 2)"

print(timeit(txt1, globals=globals(), number=2))
print(timeit(txt2, globals=globals(), number=2))

result:

Time : 2.112963530991692
Time : 0.9412867689970881

>Solution :

like @sj95126 said in the comments: the first produces 10000000 values for any() to check, the second generator produces 0 values

you can check it by calling list on it instead of any, in a more smaller sample of course

>>> lst = [0]*10
>>> any(i % 2 for i in lst)
False
>>> list(i % 2 for i in lst)
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>>> any(True for i in lst if i % 2)
False
>>> list(True for i in lst if i % 2)
[]
>>>