input: Write a python function to calculate the product of elements in a list.
  assert calculate_product([2, 3, 4]) == 24
  assert calculate_product([1, 5, 7]) == 35
  assert calculate_product([10, 20, 30]) == 6000
output: def calculate_product(lst):
      product = 1
      for num in lst:
          product *= num
      return product