Source code for landlab.field.errors

class Error(Exception):
    """Base class for errors in this module."""

    pass





class FieldError(Error, KeyError):
    """Raise this error for a missing field name."""



    def __init__(self, field):
        self._field = field


    def __str__(self):
        return self._field





class GroupError(Error, KeyError):
    """Raise this error for a missing group name."""



    def __init__(self, group):
        self._group = group


    def __str__(self):
        return self._group





class GroupSizeError(Error, KeyError):
    """Raise this error if a group has changed sizes."""



    def __init__(self, group, old_size, new_size):
        self._group = group
        self._old_size = old_size
        self._new_size = new_size


    def __str__(self):
        return (
            "number of {group} elements has changed. "
            "(was = {was}, now={now})".format(
                group=self._group, was=self._old_size, now=self._new_size
            )
        )