class DocumintErrorCause(object):
    """
    Specific error cause.
    """
    def __init__(self, type, reason, description=None):
        self.type = type
        self.reason = reason
        self.description = description


class DocumintError(RuntimeError):
    """
    Structured Documint error.
    """
    def __init__(self, causes):
        RuntimeError.__init__(self, causes)
        self.causes = causes


class MalformedDocumintError(RuntimeError):
    """
    An error, indicated by status code, was malformed.

    :ivar bytes data: Error response data.
    """
    def __init__(self, data):
        RuntimeError.__init__(self, data)
        self.data = data


__all__ = ['DocumintError', 'MalformedDocumintError']

class DocumintErrorCause(object):
    """
    Specific error cause.
    """
    def __init__(self, type, reason, description=None):
        self.type = type
        self.reason = reason
        self.description = description

    def __repr__(self):
        return '<{} type={} reason={} description={}>'.format(
            self.__class__.__name__,
            self.type,
            self.reason,
            self.description)


class DocumintError(RuntimeError):
    """
    Structured Documint error.
    """
    def __init__(self, causes):
        RuntimeError.__init__(self, causes)
        self.causes = causes


class MalformedDocumintError(RuntimeError):
    """
    An error, indicated by status code, was malformed.

    :ivar bytes data: Error response data.
    """
    def __init__(self, data):
        RuntimeError.__init__(self, data)
        self.data = data


__all__ = ['DocumintError', 'MalformedDocumintError']

Make ``DocumintErrorCause.__repr__`` more readable.