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    Basic infrastructure for extracting localizable messages from source files.

    This module defines an extensible system for collecting localizable message
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    files is builtin, extractors for other sources can be added using very
    simple plugins.

    The main entry points into the extraction functionality are the functions
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    :license: BSD, see LICENSE for more details.
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    For example, the following is the default mapping:

    >>> method_map = [
    ...     ('**.py', 'python')
    ... ]

    This basically says that files with the filename extension ".py" at any
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    The following extended mapping would also use the "genshi" extraction
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    ...     ('**/templates/**.*', 'genshi'),
    ...     ('**.py', 'python')
    ... ]

    The dictionary provided by the optional `options_map` parameter augments
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    dictionaries mapping options names to option values (both strings).

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    ...     '**/templates/**.txt': {
    ...         'template_class': 'genshi.template:TextTemplate',
    ...         'encoding': 'latin-1'
    ...     },
    ...     '**/templates/**.html': {
    ...         'include_attrs': ''
    ...     }
    ... }

    :param dirname: the path to the directory to extract messages from.  If
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    ...    print(_('Hello, world!'))
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