[FIXED] Python list function or list comprehension

Issue

Can anybody please explain to me the difference between these two ways of creating a list. Are they the same thing ? If not which one should I use ?

squares1 = [x**2 for x in range(1, 11)]
squares2 = list(x**2 for x in range(1, 11))

Solution

There is a slight bit of difference in their performance as can be seen from the following:

squares1 = [x**2 for x in range(1, 11)]

3.07 µs ± 70 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

squares2 = list(x**2 for x in range(1, 11))

3.65 µs ± 35.6 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

this can primarily be because in case 1 you are iterating and generating values for the list at the same time.

In case 2 you are generating values while iterating and then at the end of it converting the same to a list and this is then stored as a given variable.

Answered By - Inder