我从MySQL中获取一些温度数据,我在这样的元组中收到这些数据: ((十进制(&#39; 28.7&#39;),),(十进制(&#39; 28.7&#39;),),(十进制(&#39; 28.6&#39;),))< / p>
我似乎无法弄清楚如何获得这些价值的平均值。
希望有人知道,这很容易解决? :)
有时这些元组包含更多数据,有时更少,但正如所说的目标是以某种方式获得平均值。
这是我现在的代码:
db = MySQLdb.connect("localhost","user","pass","weather")
cursor = db.cursor()
sql = "SELECT "+dbcolumn+" FROM weather_data WHERE DATETIME > NOW() - INTERVAL 15 MINUTE"
cursor.execute(sql)
fetched = cursor.fetchall()
cursor.close()
db.close()
#This prints out each item in the tuple nicely on separate rows
for i in fetched:
print(i[0])
print("next is the average:")
#This currently prints the tuple, but should be modified to print the average of the tuple instead
print(fetched)
谢谢你们!
编辑:我最终创建了一个函数,它返回了元组的平均值。 这就是这个功能:#This function finds the average in a tuple, as from the minutedata function
def averager(incoming):
datasummary = 0
itemsnumber = 0
for i in incoming:
datasummary = datasummary + i[0]
itemsnumber = itemsnumber + 1
dataaverage = datasummary / itemsnumber
return dataaverage
答案 0 :(得分:0)
如果您想在不提取数据的情况下获得平均值,可以直接在查询中使用AVG MYSQL function
答案 1 :(得分:0)
我最终创建了一个函数,它返回了元组的平均值。这就是函数:
#This function finds the average in a tuple, as from the minutedata function
def averager(incoming):
datasummary = 0
itemsnumber = 0
for i in incoming:
datasummary = datasummary + i[0]
itemsnumber = itemsnumber + 1
dataaverage = datasummary / itemsnumber
return dataaverage