[Tutor] EXTERNAL: Summing arrays

[Joaquin Henriquez]

>def sum2(N):
>    b = np.arange(1,N+1,1)
 >   mylist = [ ]
  >  for i in b:
>        terms = 2*(1+3**(i-1))
 >       a = mylist.append[terms]
  >  return np.sum(mylist)

>print(sum2(N=50))


You have an error such as:
a = mylist.append(terms)