On Sunday, 9 October 2016 04:25:39 UTC+11, Emmanuel Charpentier wrote:
>
> I wonder if it is possible to patch a new method in an existing class. For
> example, it might be handy to give SR methods for doing what can be
> obtained by Maxima's function demoivre and exponentialize. Those methods
> would be wrappers for the (existing) functions maxima.demoivre and
> maxima.exponentialize, along the lines of
> return(maxima.demoivre(self).sage() (ditto for exponentialize).
>
Yes this is possible, although possibly python purists will object!
When I need/want to do this I use the following decorator:
Andrew
def add_method_to_class(klass):
r"""
Add a new method to a pre-existing (sage) class.
"""
def add_func(func):
setattr(klass,func.func_name,func)
return func
return add_func
The decorator takes the class that you want to add the method to as an
argument.
As a silly example of usage, the following lines add a method to the
Partition class:
@add_method_to_class(Partition):
def new_partition_method(self):
r"""
Usual sage/python documentation
"""
return sum(self)
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