input: Write a function to calculate the sum of the series 1 + ½ + ⅓ + ... + 1/n. Provide the value of n as input and return the computed sum. If the input n is 0, return 0.
  assert seriesSum(5)==2.283333333333333
  assert seriesSum(1)==1.0
  assert seriesSum(0)==0
  assert seriesSum(3)==1.8333333333333333
  assert seriesSum(10)==2.9289682539682538
output: def seriesSum(n):
      if n == 0:
          return 0
      return sum(1/i for i in range(1, n+1))