On 26.02.2018 15:41, Steven D'Aprano wrote:
I have a class with a large number of parameters (about ten) assigned in `__init__`. The class then has a number of methods which accept *optional* arguments with the same names as the constructor/initialiser parameters. If those arguments are None, the defaults are taken from the instance attributes.
Others have pointed out good solutions already, in particular, combining inspect and decorators or encapsulating the parameters in an object.
Alternatively, you could reconsider your class design. Although I can't tell from your example whether this idea would be acceptable for your use case, consider removing your parameters from the class methods (except from __init__) altogether so the values passed during instantiation cannot be changed later. In exchange, add module-level functions corresponding to each of your class methods that accept **kwargs and that generate new instances of your class passing **kwargs on to __init__, then call the corresponding instance method.
The stdlib textwrap module, for example, uses this approach. Best, Wolfgang -- https://mail.python.org/mailman/listinfo/python-list
