code: def from_connection_string(cls, conn_str, eventhub=None, **kwargs):
          
          address, policy, key, entity = _parse_conn_str(conn_str)
          entity = eventhub or entity
          address = _build_uri(address, entity)
          return cls(address, username=policy, password=key, **kwargs)
docs: Create an EventHubClient from a connection string.
  
          :param conn_str: The connection string.
          :type conn_str: str
          :param eventhub: The name of the EventHub, if the EntityName is
           not included in the connection string.
          :type eventhub: str
          :param debug: Whether to output network trace logs to the logger. Default
           is `False`.
          :type debug: bool
          :param http_proxy: HTTP proxy settings. This must be a dictionary with the following
           keys: 'proxy_hostname' (str value) and 'proxy_port' (int value).
           Additionally the following keys may also be present: 'username', 'password'.
          :type http_proxy: dict[str, Any]
          :param auth_timeout: The time in seconds to wait for a token to be authorized by the service.
           The default value is 60 seconds. If set to 0, no timeout will be enforced from the client.
          :type auth_timeout: int