Source Code for Module sympycore.calculus.function

 1  """ Provides base class to calculus functions. 
 2  """ 
 3   
 4  __docformat__ = "restructuredtext" 
 5  __all__ = ['Function'] 
 6   
 7  from ..core import classes 
 8  from .algebra import Calculus 
 9   
10 -class FunctionType(type): 
11   
12 -    def __new__(typ, name, bases, attrdict): 
13          cls = type.__new__(typ, name, bases, attrdict) 
14          if 'Function' in name: 
15              setattr(classes, name, cls) 
16          else: 
17              Calculus.defined_functions[name] = cls 
18          return cls 
19   
20 -class Function(object): 
21      """ Base class to calculus functions. 
22   
23      Subclasses are added to the dictionary Calculus.defined_functions. 
24      """ 
25      __metaclass__ = FunctionType 
26   
27      @classmethod 
28 -    def derivative(cls, arg): 
29          """ Return derivative function of cls at arg. 
30          """ 
31          raise NotImplementedError 
32