stablerange: introduce an 'basicstablerange'
This class hold all the basic of stable range but the part specific to the
sorting.
This allow to clearly express what is expected from each method and to generate
tests output to be validated against the more complex implementation.
While writing this, we spotted a bug in the current stable range implementation.
Fix coming.
[flake8]
ignore =
#closing bracket does not match indentation of opening bracket's line
E123,
# closing bracket does not match visual indentation
E124,
# visually indented line with same indent as next logical line
E129,
# at least two spaces before inline comment
E261,
# too many leading '#' for block comment
E266,
# expected 2 blank lines, found 0
E302,
# expected 2 blank lines after end of function or class
E305,
# module level import not at top of file
E402,
# line too long (82 > 79 characters)
E501,
# do not assign a lambda expression, use a def
E731,
# class names should use CapWords convention
N801,
# line break occurred before a binary operator
W503
builtins=xrange, execfile