["python","list","multidimensional-array"]
How to get every first element in 2 dimensional list

I have a list like this: a = [[4.0, 4, 4.0], [3.0, 3, 3.6], [3.5, 6, 4.8]] I want an outcome like this (EVERY first element in the list): 4.0, 3.0, 3.5 I tried a[::1][0], but it doesn't work
You can get the index [0] from each element in a list comprehension >>> [i[0] for i in a] [4.0, 3.0, 3.5]