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    jinja2.loaders
    ~~~~~~~~~~~~~~

    Jinja loader classes.

    :copyright: (c) 2017 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
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    A very basic example for a loader that looks up templates on the file
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        from jinja2 import BaseLoader, TemplateNotFound
        from os.path import join, exists, getmtime

        class MyLoader(BaseLoader):

            def __init__(self, path):
                self.path = path

            def get_source(self, environment, template):
                path = join(self.path, template)
                if not exists(path):
                    raise TemplateNotFound(template)
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