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Initialize the template engine.
`params` is a dict of configuration settings.
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Create and return a template for the given source code.
This method is optional.
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Load and return a template for the given name.
Raise TemplateDoesNotExist if no such template exists.
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Return a list of directories to search for templates.
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Iterate over candidate files for template_name.
Ignore files that don't lie inside configured template dirs to avoid
directory traversal attacks.
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