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# Source code for asdf

    # Licensed under a 3-clause BSD style license - see LICENSE.rst
    # -*- coding: utf-8 -*-

    from __future__ import absolute_import, division, unicode_literals, print_function

    """
    asdf: Python library for reading and writing Advanced Scientific
    Data Format (ASDF) files
    """

    # Affiliated packages may add whatever they like to this file, but
    # should keep this content at the top.
    # ----------------------------------------------------------------------------
    from ._internal_init import *
    # ----------------------------------------------------------------------------

    if _ASDF_SETUP_ is False:
        __all__ = ['AsdfFile', 'CustomType', 'AsdfExtension',
                   'Stream', 'open', 'test', 'commands',
                   'ValidationError']

        try:
            import yaml as _
        except ImportError:
            raise ImportError("asdf requires pyyaml")

        try:
            import jsonschema as _
        except ImportError:
            raise ImportError("asdf requires jsonschema")

        try:
            import numpy as _
        except ImportError:
            raise ImportError("asdf requires numpy")

        from .asdf import AsdfFile
        from .asdftypes import CustomType
        from .extension import AsdfExtension
        from .stream import Stream
        from . import commands

        from jsonschema import ValidationError

        class ValidationError(ValidationError):
            pass

        open = AsdfFile.open