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babel.messages.checkers
~~~~~~~~~~~~~~~~~~~~~~~
Various routines that help with validation of translations.
:since: version 0.9
:copyright: (c) 2013-2025 by the Babel Team.
:license: BSD, see LICENSE for more details.
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X� < S35 e g)a� Test format string `alternative` against `format`. `format` can be the
msgid of a message and `alternative` one of the `msgstr`\s. The two
arguments are not interchangeable as `alternative` may contain less
placeholders if `format` uses named placeholders.
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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