#NEWLINE# def sub_map( self , counters_map ) : #NEWLINE# #INDENT# 'Subtracts all counters from the map.\n\n    For each counter in the passed map, subtracts its value to the counter in\n    this map.\n\n    Args:\n      counters_map: CounterMap instance to subtract.\n    ' #NEWLINE# for counter_name in counters_map . counters : #NEWLINE# #INDENT# self . increment ( counter_name , ( - counters_map . counters [ counter_name ] ) )