def validate(instance, schema, cls=None, *args, **kwargs):
    """
    Validate an instance under the given schema.

        >>> validate([2, 3, 4], {"maxItems" : 2})
        Traceback (most recent call last):
            ...
        ValidationError: [2, 3, 4] is too long

    :func:`validate` will first verify that the provided schema is itself
    valid, since not doing so can lead to less obvious error messages and fail
    in less obvious or consistent ways. If you know you have a valid schema
    already or don't care, you might prefer using the
    :meth:`~IValidator.validate` method directly on a specific validator
    (e.g. :meth:`Draft4Validator.validate`).


    :argument instance: the instance to validate
    :argument schema: the schema to validate with
    :argument cls: an :class:`IValidator` class that will be used to validate
                   the instance.

    If the ``cls`` argument is not provided, two things will happen in
    accordance with the specification. First, if the schema has a
    :validator:`$schema` property containing a known meta-schema [#]_ then the
    proper validator will be used.  The specification recommends that all
    schemas contain :validator:`$schema` properties for this reason. If no
    :validator:`$schema` property is found, the default validator class is
    :class:`Draft4Validator`.

    Any other provided positional and keyword arguments will be passed on when
    instantiating the ``cls``.

    :raises:
        :exc:`ValidationError` if the instance is invalid

        :exc:`SchemaError` if the schema itself is invalid

    .. rubric:: Footnotes
    .. [#] known by a validator registered with :func:`validates`
    """
    if cls is None:
        cls = validator_for(schema)
    cls.check_schema(schema)
    cls(schema, *args, **kwargs).validate(instance)
def validate ( instance , schema , cls = None , * args , ** kwargs ) : if cls is None : cls = validator_for ( schema ) cls . check_schema ( schema ) cls ( schema , * args , ** kwargs ) . validate ( instance )
Validate an instance under the given schema.

        >>> validate([2, 3, 4], {"maxItems" : 2})
        Traceback (most recent call last):
            ...
        ValidationError: [2, 3, 4] is too long

    :func:`validate` will first verify that the provided schema is itself
    valid, since not doing so can lead to less obvious error messages and fail
    in less obvious or consistent ways. If you know you have a valid schema
    already or don't care, you might prefer using the
    :meth:`~IValidator.validate` method directly on a specific validator
    (e.g. :meth:`Draft4Validator.validate`).


    :argument instance: the instance to validate
    :argument schema: the schema to validate with
    :argument cls: an :class:`IValidator` class that will be used to validate
                   the instance.

    If the ``cls`` argument is not provided, two things will happen in
    accordance with the specification. First, if the schema has a
    :validator:`$schema` property containing a known meta-schema [#]_ then the
    proper validator will be used.  The specification recommends that all
    schemas contain :validator:`$schema` properties for this reason. If no
    :validator:`$schema` property is found, the default validator class is
    :class:`Draft4Validator`.

    Any other provided positional and keyword arguments will be passed on when
    instantiating the ``cls``.

    :raises:
        :exc:`ValidationError` if the instance is invalid

        :exc:`SchemaError` if the schema itself is invalid

    .. rubric:: Footnotes
    .. [#] known by a validator registered with :func:`validates`