new_contents: #!/usr/bin/env python3
  
  """This script is written by Chuanping Yu, on Jul 24, 2017,
  for the Assignment#1 in IDEaS workshop"""
  
  #Problem 5
  from fractions import gcd
  def lcm(int1, int2):
      """Calculate the least common multiple of two integers, a and b."""
      return int(int1*int2/gcd(int1, int2))
  from functools import reduce
  print(reduce(lcm, range(1, 20+1)))
  
subject: Add Chuanping Yu's solutions to Problem05