input: Write a function to calculate the sum of the series 1 + ½ + ⅓ + ... + 1/n for a given positive integer n. The function should return the total sum of the series. If n is 0, the function should return 0. 
  assert seriesSum(5)==2.283333333333333
  assert seriesSum(3)==1.8333333333333333
  assert seriesSum(0)==0
  assert seriesSum(1)==1.0
output: def seriesSum(n):
      if n == 0:
          return 0
      total = 0
      for i in range(1, n + 1):
          total += 1 / i
      return total