TypeError: can't multiply sequence by non-int of type 'float'. Python 3

Question

first = int(list1[0] + list1[1]) 

a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,a20,a21,a22,a23 = map(float, list1)

if first == 11:
            c = con.execute("SELECT Centroid FROM Centroid WHERE ItemID = 1")
            centroid = c.fetchone()
            AA = (min(a1, a2) * centroid) + (pow(a3,2))
            BB = (min(a1, a2) + a3)
            WA = AA/BB
            print (WA)

以上是我的代码。我现在的问题是出现错误：

TypeError: can't multiply sequence by non-int of type 'float'

我使用的变量（a1,a2,a3,centriod）是一种浮点型。

Answer 1

您需要从元组中获取质心的第一个元素用作值，因为 type(centroid) is tuple 是 True。使用：

centroid = c.fetchone()[0]

TypeError: can't multiply sequence by non-int of type 'float'. Python 3

TypeError: can't multiply sequence by non-int of type 'float'. Python 3

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python-3.x