remove Single type, rework get stream

influx.py

@@ -119,15 +119,6 @@ class Table(list):
             yield sep.join(result)
 
 
-class Single(Table):
-    """a single row of a table, as a list with meta info"""
-    def __init__(self, tags=None, key_names=(), column_names=(), rows=None):
-        super().__init__(tags, key_names, column_names)
-        if rows:
-            single_row, = rows
-            self[:] = single_row
-
-
 class RegExp(str):
     """indicates, tht this string should be treated as regexp
 
@@ -279,9 +270,10 @@ class InfluxDBWrapper:
         :param stop: end time (default: eternity = 1 year in the future)
         :param interval: if set an aggregation filter will be applied. This will
                          return only the latest values per time interval in seconds.
-        :param single: when True (or 1), only the last value within the interval is returned
+        :param single: when not 0, only the last value within the interval is returned
+                       the resulting tables have all exactly one row
                        (for any existing combinations of tags!)
-                       single=-1: return the first value instead
+                       single < 0: return the first value instead
         :param columns: if given, return only these columns (in addition to '_time' and '_value')
         :param tags: selection criteria:
              <tag>=None
@@ -300,12 +292,9 @@ class InfluxDBWrapper:
         """
         result = {}
         for rows, key, props in self.query_gen(start, stop, interval, single, columns, **tags):
-            if single:
-                result[key] = Single(*props, rows=rows)
-            else:
-                table = Table(*props, rows=rows)
-                table.sort()
-                result[key] = table
+            table = Table(*props, rows=rows)
+            table.sort()
+            result[key] = table
         return result
 
     def query_gen(self, start=None, stop=None, interval=None, single=None, columns=None, **tags):