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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_repo_file_url(namespace, filename):
 """Return the URL for hosted file in Gluon repository. Parameters namespace : str Namespace of the file. filename : str Name of the file """

    return '{base_url}{namespace}/{filename}'.format(base_url=_get_repo_url(),
                                                     namespace=namespace,
                                                     filename=filename)