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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 _build(credentials, api_version, http_client=None):
 """Build the client object."""

    if not http_client:
        http_client = httplib2.Http()

    authorised_client = credentials.authorize(http_client)

    return build("analytics", api_version, http=authorised_client)