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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:
 async def get_content_count(self, source: str):
 """Return file listing for source."""

        params = {"uri": source, "type": None, "target": "all", "view": "flat"}
        return ContentInfo.make(
            **await self.services["avContent"]["getContentCount"](params)
        )