new_contents: import os
  import imp
  
  _formula_cache = {}
  
  _default_search_path = [os.path.join(os.path.dirname(__file__), "..", "Formula")]
  
  class FormulaManager:
      @staticmethod
      def _find(name, search_path=[]):
          file_path = ""
          for path in search_path + default_search_path:
              if os.path.exists(os.path.join(path, name + ".py")):
                  file_path = os.path.join(path, name + ".py")
          return file_path
      
      @staticmethod    
      def get(name, search_path=[]):
          file_path = ""
  
          #name can be a path
          if os.path.isfile(name):
              file_path = name
              
          name = os.path.splitext(os.path.basename(file_path))[0]
          
          if _formula_cache.has_key(name):
              return _formula_cache[name]
          else:
              if not file_path:
                  file_path = FormulaManager._find(name, search_path)
              
              formula = imp.load_source(name, file_path)
              _formula_cache[name] = formula
              
              return formula
      
          
subject: Implement class for managing formulas