input: Write a function to populate an array with random numbers from 1 to 100 given the desired length of the array. The function should return the populated array.
  assert populateArray(5)==[random.randint(1, 100), random.randint(1, 100), random.randint(1, 100), random.randint(1, 100), random.randint(1, 100)]
output: import random
  
  def populateArray(length):
      return [random.randint(1, 100) for _ in range(length)]