Python代码运行结果错误：Typeerror？求解！

代码和运行结果如下所示

from network_graph import graph_list_2
import time

start =time.clock()


graph_list = graph_list_2

n = 10 

workload = np.random.randint(0,30,size=n) 

x = [0]*n 

best_x = [0]*n 

min_cost = n+1 


def conflict(k):
    global n,x,bext_x,min_cost 
    cap = [80]*n 
   
    for i in range(len(x[:k+1])):
        cap[x[i]] = cap[x[i]]-workload[i] 
    
    for i in range(n):
        if cap[i] < 0: 
            return True
    
  
    cost = len(set(x[:k+1]))
    
    if 0 < min_cost <= cost:
        return True
    
    return False

def mec_pla(k): 
    global n,graph_list,x,min_cost,best_x
    if k>=n: 
        cost = len(set(x[:k])) 
        if cost <= min_cost: 
             best_x = x[:]
             min_cost = cost
             print(x)
    else:
        for node in graph_list[k]: 
            x[k] = node
            if not conflict(k):
                mec_pla(k+1)
                
mec_pla(0)
print(best_x)
print(min_cost)

end = time.clock()
print('Running time: %s Seconds'%(end-start))

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请问该如何修改呢

错误提示比较清楚，类型错误，generator对象不能用下标

对象不是迭代器，生成器不能直接迭代获取

先找这个文件，错误在这里报的

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