Python 从记录类型获取特定值的数目

我有以下记录类型

from recordtype import recordtype

thermometer = recordtype('thermometer', 'sent_level1, sent_level2, name, group')
thermometers =  { 
                 "1A": thermometer(False, False, "t1", "warehouse"),
                 "1B": thermometer(False, False, "t2", "warehouse"),
                 "1C": thermometer(False, False, "t3", "warehouse"),
                 "1E": thermometer(False, False, "t4", "warehouse"),
                 "1F": thermometer(False, False, "t5", "serverroom"),
                 "1G": thermometer(False, False, "t6", "serverroom"),
                 "1H": thermometer(False, False, "t7", "serverroom")
                }

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我想获得group=warehouse的项目数量，而不必考虑太多，这是可行的：

count = 0
for i in thermometers.values():
    if 'warehouse' in i:
        count+=1