Python Scipy目标函数

我正在尝试将我的gurobi代码转换为scipy，但在定义目标函数时遇到了问题。在测试函数定义是否正确时，会出现以下错误：

TypeError: 'float' object is not iterable

代码如下：

import pandas as pd
import numpy as np
import scipy as sp
from scipy.optimize import minimize
import matplotlib.pyplot as plt
%matplotlib inline
step=80
f1load=[44,48,53,28,32,36,41,48,38,32,38,34,44,36,41,48,38,32,44,48,53,28,32,36,41,48,38,32,38,34,44,36,41,48,38,32,44,48,53,28,32,36,41,48,38,32,38,34,44,36,41,48,38,32,44,48,53,28,32,36,41,48,38,32,38,34,44,36,41,48,38,32,44,48,53,28,32,36,41,48,38,32,38,34,44,36,41,48]
fload=f1load[0:step+1]
i1load=[40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40,40]
iload=i1load[0:step+1]
#Following command converts fload&iload to arrays and subtracts them from each other 
load1=np.array(iload)-np.array(fload)
load1
#This command converts array to list so we can use it as a list in the rest of the code
load2=load1.tolist()
load=load2
x = np.zeros(80)
x = x.tolist()
def objective(x,load):
# this line is from my gurobi code    obj1=sum(((load[i+1]-(6*x[i]))*(load[i+1]-(6*x[i])) for i in range (n)))
    for i in range(step):
        obj1 = sum((load[i+1]-(6*x[i]))*(load[i+1]-(6*x[i])))
        obj2 = obj2 + obj1
    return obj2

objective(x,load)

错误的完整堆栈跟踪：

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-26-cef8470baf0d> in <module>
----> 1 objective(x,load)

<ipython-input-25-a9de3ab9ff2b> in objective(x, load)
      2 #     obj1=sum(((load[i+1]-(6*x[i]))*(load[i+1]-(6*x[i])) for i in range (n)))
      3     for i in range(step):
----> 4         obj1 = sum((load[i+1]-(6*x[i]))*(load[i+1]-(6*x[i])))
      5         obj2 = obj2 + obj1
      6     return obj2

TypeError: 'float' object is not iterable

---------------------------------------------------------------------------
TypeError回溯（最近一次调用上次）
在里面
---->1个目标（x，负载）
在目标中（x，载荷）
2#obj1=范围（n）内i的总和（（加载[i+1]-（6*x[i]）*（加载[i+1]-（6*x[i]））
3对于范围内的i（步骤）：
---->4 obj1=总和（（荷载[i+1]-（6*x[i]））*（荷载[i+1]-（6*x[i]））
5 obj2=obj2+obj1
6返回obj2
TypeError:“float”对象不可编辑

在这一行：

obj1 = sum((load[i+1]-(6*x[i]))*(load[i+1]-(6*x[i])))

parantesses中的表达式，

（load[i+1]-（6*x[i]）*（load[i+1]-（6*x[i]）

，计算结果为一个

float

，对该表达式调用

sum

会产生错误，因为

sum

函数需要一个iterable参数