Question

How can I: Write a program to input 2 numbers, first and diff. The program will then create a one-dimensional array of 16 elements in an arithmetic sequence which is printed out.
 For example, if first is 21 and diff = 5, the arithmetic sequence will be:
 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96

Answer 1

first = input("First: ")
diff = input("Diff: ")
for i in range(16):
n = first + i * diff
print n,

Answer 2

There's actually a formula that will do this with the range function on a single line:

range(x, ((z * y) + x), y)

x = first number
y = difference
z = length of array.

This should not only work for any x or y but for any z as well.

Answer 3

Well actually, I just realized mine won't work if y = 0, unlike dmancine's. It would have to be:

if y == 0:
[x, ] * z
else:
range(x, ((z * y) + x), y)

Answer 4

I talk a lot about style. But, just as a style point, I tend to make my for loops just loop from 0 to some number, with an increment of 1. If I need to calculate something fancier for each iteration I write an explicit expression inside the loop, using the loop variable. That makes the for loop a little easier to follow, and makes the computation more explicit. Of course there are some exceptions. True, it's not the most concise way to do it, but I find it usually a bit clearer.

But, of course, a good one-liner is always pretty cool.

Answer 5

http://codepad.org/hNrvftzP