old_contents: 
  from powerseries import *
  
  def comtet():
      N = 20
      def _fac():
          r = 1
          for n in count():
              yield r
              r*= n+1
      
      fac = PowerSeries( _fac )
      print("fac: ", fac.getstr(N))
  
      F = fac - 1
      I = F / ( 1 + F)
  
      Finv = solve( Y - F )[0]
      print("Finv: ", Finv.getstr(N))
  
  def main():
      comtet()
  
  if __name__ == '__main__':
      import cProfile
      cProfile.run('main()')
  
new_contents: 
  from pwrsrs import *
  
  def comtet():
      N = 20
      def _fac():
          r = 1
          for n in count():
              yield r
              r*= n+1
      
      fac = PowerSeries( _fac )
      print("fac: ", fac.getstr(N))
  
      F = fac - 1
      I = F / ( 1 + F)
  
      Finv = solve( Y - F )[0]
      print("Finv: ", Finv.getstr(N))
  
  def main():
      comtet()
  
  if __name__ == '__main__':
      import cProfile
      cProfile.run('main()')
  
subject: Rename + readme