== Why is this an issue?

``++NotImplemented++`` is a constant which is intended to be used only by comparison methods such as ``++__lt__++``. Use it instead of  ``++NotImplementedError++``, which is an exception, and callers will have a hard time using your code.


=== Noncompliant code example

[source,python]
----
class MyClass:
    def do_something(self):
        raise NotImplemented("Haven't gotten this far yet.")  #Noncompliant
----


=== Compliant solution

[source,python]
----
class MyClass:
    def do_something(self):
        raise NotImplementedError("Haven't gotten this far yet.")  
----



ifdef::env-github,rspecator-view[]
'''
== Comments And Links
(visible only on this page)

=== on 28 Apr 2015, 10:04:00 Ann Campbell wrote:
http://mouadino.appspot.com/notimpelementederror-vs-notimplemented-in-python/

=== on 31 Jan 2020, 15:48:43 Nicolas Harraudeau wrote:
Closing in favor of RSPEC-5632.

``++NotImplemented++`` does not derive from BaseException so it will fail as any other non-exception.

endif::env-github,rspecator-view[]