Python 3 Array Operations I want to create an array of specified indexes.

If the slices that have already been discussed do not work, I do not know if they can be called "bulk", but there is a inclusive.An example of the question is as follows:

# [Original list [i] for in extracting indexes]

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
b = [a[i]for in(3,6,9)]
print(b)
# => [4,7,10]

(The word "nth" in Japanese is ambiguous, so you should be careful. Python and others have a zero index for the first element, but in Japanese, they are often referred to as "first").

operator.itemgetter.

https://docs.python.org/ja/3/library/operator.html#operator.itemgetter

In[1]: A = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

In [2]: B = [4,7,10]

In[3]: from operator import itemgetter

In[4]: list (itemgetter(3,6,9)(A))
Out [4]: [4,7,10]

I would like to do it all at once without For or append.

If you don't want to use For or append and you want to take out any array, isn't this OK?

a=[1, 2, 3, 4, 5, 8, 7, 8, 9, 10]
b=[a[3], a[6], a[9]]
print(b)
# = > [4,7,10]