def get_operation_log(self): 
    # The starting location of query for batch acquisition of lists, and is one string generated by the system. 
    marker = 'your-marker' 
    # Maximum number contained in each page, generally not exceeding 1000. The default value is 100. 
    max_keys = 100
    # To query the start time of physical machine operation (UTC time), the format is yyyy-MM-dd'T'HH:mm:ss'Z' ; if it is empty, query the operation log of the day 
    start_time = '' 
    # To query the end time (UTC time) of the physical machine operation, the format is yyyy-MM-dd'T'HH:mm:ss'Z' ; if it is empty, query the operation log of the day 
    end_time = '' 
    self.client.get_operation_log(marker = marker, max_keys = max_keys, start_time = start_time, end_time = end_time)