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什么是动态创建Python对象实例的最佳方法是将Python类保存为字符串？

作为背景,我在Google Application Engine环境中工作,我希望能够从类的字符串版本动态加载类.

problem = “1,2,3,4,5”

solvertext1 = “””class solver:
  def solve(self, problemstring):
   return len(problemstring) “””

solvertext2 = “””class solver:
  def solve(self, problemstring):
   return problemstring[0] “””

solver = #The solution code here (solvertext1)
answer = solver.solve(problem) #answer should equal 9

solver = #The solution code here (solvertext2) 
answer = solver.solve(problem) # answer should equal 1