input: Write a function to determine if it is possible to create an empty Python class named Vector3D with an __init__ method that takes three parameters (x, y, z) and initializes three attributes (x, y, z), and a method named length that calculates and returns the magnitude of the vector. The function should return True if all assertions pass, otherwise return False. If no input is provided, the function should return True.
  assert create_vector_class(
      '''
      class Vector3D:
          def __init__(self, x, y, z):
              self.x = x
              self.y = y
              self.z = z
          
          def length(self):
              return (self.x**2 + self.y**2 + self.z**2)**0.5
      '''
  ) == True
  assert create_vector_class(
      '''
      class Vector3D:
          def __init__(self, x, y, z):
              self.x = x
              self.y = y
              self.z = z
          
          def length(self):
              return (self.x**2 + self.y**2 + self.z**2)**0.5
      '''
  ) == True
  assert create_vector_class(
      '''
      class Vector3D:
          def __init__(self, x, y):
              self.x = x
              self.y = y
          
          def length(self):
              return (self.x**2 + self.y**2 + self.z**2)**0.5
      '''
  ) == False
  assert create_vector_class(
      '''
      class Vector3D:
          def __init__(self, x, y, z):
              self.x = x
              self.y = y
              self.z = z
          
          def length(self):
              return (self.x**2 + self.y)
      '''
  ) == False
  assert create_vector_class('') == True
output: def create_vector_class(code):
      if not code:
          return True
      
      try:
          exec(code)
          vec = Vector3D(1, 2, 3)
          expected_length = (1**2 + 2**2 + 3**2)**0.5
          return vec.length() == expected_length
      except:
          return False