R function rep() in Python (replicates elements of a list/vector)

Question

The R function rep() replicates each element of a vector:

> rep(c(\"A\",\"B\"), times=2)
[1] \"A\" \"B\" \"A\" \"B\"

This is like the list m

Answer 1

Since you say "array" and mention R. You may want to use numpy arrays anyways, and then use:

import numpy as np
np.repeat(np.array([1,2]), [2,3])

EDIT: Since you mention you want to repeat rows as well, I think you should use numpy. np.repeat has an axis argument to do this.

Other then that, maybe:

from itertools import izip, chain, repeat
list(chain(*(repeat(a,b) for a, b in izip([1,2], [2,3]))))

As it doesn't make the assumption you have a list or string to multiply. Though I admit, passing everything as argument into chain is maybe not perfect, so writing your own iterator may be better.