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Commonly useful validators.
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    A validator that raises a `TypeError` if the initializer is called
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    A validator that raises `ValueError` if the initializer is called
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    A validator that raises a `TypeError` if the initializer is called
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    :param interface: The interface to check for.
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    A validator that makes an attribute optional.  An optional attribute is one
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    A validator that raises a `ValueError` if the initializer is called
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    A validator that performs deep validation of an iterable.

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    A validator that performs deep validation of a dictionary.

    :param key_validator: Validator to apply to dictionary keys
    :param value_validator: Validator to apply to dictionary values
    :param mapping_validator: Validator to apply to top-level mapping
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    .. versionadded:: 19.1.0

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