new_contents: from taxcalc import *
  #Create a Parameters object
  params = Parameters()
  print(params.almdep)
  
  #Create a Public Use File object
  puf = PUF("puf2.csv")
  
  #Create a Calculator
  calc = Calculator(parameters=params, puf=puf)
  
  #The Current Year is given from the Parameters and PUF objects
  print(calc.current_year)
  
  #Parameters that vary by year are scalars based on the current year
  print(params.almdep)
  
  #All the calculation happens through this interface
  calc.calc_all()
  
  #The year is incremented
  calc.increment_year()
  
  #The parameters scalars are updated, as is the PUF data
  # (aging data by inflation)
  print(params.almdep)
  
  #Calculate again for the year
  calc.calc_all()
  
subject: add example of usage