Checking for alternating parity

Question

I am struggling to find a way to check if every other number in my list is of an alternating parity (i.e. even, odd, even, odd, etc.)

[1,2,3,4] # odd, even, odd, even (True, because they alternate)
[1,3,2,4] # odd, odd, even, even (False, because they don't alternate)

Anyone have any idea how I can check for this?

Answer 1

Here

def alter(ls):
  for i in range(len(ls)-1):
      if ls[i]%2 == ls[i+1]%2:
         return False
  return True