@classmethod are used in Python to represent methods that can
query and update the class (cls parameter). Is expected to be
used for metaprograming, or advanced techniques that require the
access to the class itself, before we have an instance.
@staticmethod are used to associate a function to a class. It will
not be have access to the instance (self) not the class (cls). In
other programming languages are known as class methods.
This patch replace all the @classmethod with @staticmethod when
there is not need to access to the cls parameter, because the
intention is to be used as normal functions.
The new version of flake8 is more strict on code checking and
complained at several places. This commit fixes the code smells
such that flake8 is happy again
Now the locale pattern in the schema also supports POSIX. Note
that POSIX will be only accepted if listed in the first place of the comma
separated list.
This commit fixes#570
