<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def Analyze(self, hashes):
 """Looks up hashes in VirusTotal using the VirusTotal HTTP API. The API is documented here: https://www.virustotal.com/en/documentation/public-api/ Args: hashes (list[str]):
 hashes to look up. Returns: list[HashAnalysis]: analysis results. Raises: RuntimeError: If the VirusTotal API key has not been set. """

    if not self._api_key:
      raise RuntimeError('No API key specified for VirusTotal lookup.')

    hash_analyses = []

    json_response = self._QueryHashes(hashes) or []

    # VirusTotal returns a dictionary when a single hash is queried
    # and a list when multiple hashes are queried.
    if isinstance(json_response, dict):
      json_response = [json_response]

    for result in json_response:
      resource = result['resource']
      hash_analysis = interface.HashAnalysis(resource, result)
      hash_analyses.append(hash_analysis)

    return hash_analyses