Repository: matplotlib/matplotlib
File: lib/matplotlib/scale.py (Python)

Code before:
            raise ValueError('arguments to FuncTransform must be functions')

    def transform_non_affine(self, values):
        return self._forward(values)

    def inverted(self):
        return FuncTransform(self._inverse, self._forward)


class FuncScale(ScaleBase):
    """
    Provide an arbitrary scale with user-supplied function for the axis.
    """

    name = 'function'

    @_make_axis_parameter_optional
    def __init__(self, axis, functions):
        """
        Parameters
        ----------
        axis : `~matplotlib.axis.Axis`
            The axis for the scale.

            .. note::
                This parameter is unused and about to be removed in the future.
                It can already now be left out because of special preprocessing,
                so that ``FuncScale(functions)`` is valid.

        functions : (callable, callable)
            two-tuple of the forward and inverse functions for the scale.
            The forward function must be monotonic.

            Both functions must have the signature::

               def forward(values: array-like) -> array-like
        """
        forward, inverse = functions
        transform = FuncTransform(forward, inverse)
        self._transform = transform

    def get_transform(self):
        """Return the `.FuncTransform` associated with this scale."""
        return self._transform

    def set_default_locators_and_formatters(self, axis):
        # docstring inherited
        axis.set_major_locator(AutoLocator())
        axis.set_major_formatter(ScalarFormatter())
        axis.set_minor_formatter(NullFormatter())
        # update the minor locator for x and y axis based on rcParams

Review comment (suggestion):
```suggestion
                This parameter is unused and will be removed in an imminent release.
```


Code after:

    def transform_non_affine(self, values):
        return self._forward(values)

    def inverted(self):
        return FuncTransform(self._inverse, self._forward)


class FuncScale(ScaleBase):
    """
    Provide an arbitrary scale with user-supplied function for the axis.
    """

    name = 'function'

    @_make_axis_parameter_optional
    def __init__(self, axis, functions):
        """
        Parameters
        ----------
        axis : `~matplotlib.axis.Axis`
            The axis for the scale.

            .. note::
                This parameter is unused and will be removed in an imminent release.
                It can already be left out because of special preprocessing,
                so that ``FuncScale(functions)`` is valid.

        functions : (callable, callable)
            two-tuple of the forward and inverse functions for the scale.
            The forward function must be monotonic.

            Both functions must have the signature::

               def forward(values: array-like) -> array-like
        """
        forward, inverse = functions
        transform = FuncTransform(forward, inverse)
        self._transform = transform

    def get_transform(self):
        """Return the `.FuncTransform` associated with this scale."""
        return self._transform

    def set_default_locators_and_formatters(self, axis):
        # docstring inherited
        axis.set_major_locator(AutoLocator())
        axis.set_major_formatter(ScalarFormatter())
        axis.set_minor_formatter(NullFormatter())
        # update the minor locator for x and y axis based on rcParams
        if (axis.axis_name == 'x' and mpl.rcParams['xtick.minor.visible'] or