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    babel.messages.checkers
    ~~~~~~~~~~~~~~~~~~~~~~~

    Various routines that help with validation of translations.

    :since: version 0.9

    :copyright: (c) 2013-2019 by the Babel Team.
    :license: BSD, see LICENSE for more details.
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    The behavior of this function is undefined if the string does not use
    string formattings.

    If the string formatting of `alternative` is compatible to `format` the
    function returns `None`, otherwise a `TranslationError` is raised.

    Examples for compatible format strings:

    >>> _validate_format('Hello %s!', 'Hallo %s!')
    >>> _validate_format('Hello %i!', 'Hallo %d!')

    Example for an incompatible format strings:

    >>> _validate_format('Hello %(name)s!', 'Hallo %s!')
    Traceback (most recent call last):
      ...
    TranslationError: the format strings are of different kinds

    This function is used by the `python_format` checker.

    :param format: The original format string
    :param alternative: The alternative format string that should be checked
                        against format
    :raises TranslationError: on formatting errors
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