code: def calc_basics(width=-1, length=-1, height=2.4, prevailing_wind=2.8):   
      
      if width == -1:
          width = int(input('enter building width : '))
      if length == -1:
          length = int(input('enter building length : '))
      res = {}
      
      res['area'] = width * length
      res['perim'] =  2 * width + 2 * length
      res['roof_cladding'] = res['area']
      res['wall_cladding'] = res['perim'] * height
      pprint(res)
      return res
docs: calculate various aspects of the structure